DESCRIPTION AUDIO PLAYER, AUDIO PLAYING METHOD, AND AUDIO PLAYING PROGRAM Technical Field [0001] The present invention relates to a device having a function for playing audio, such as for example, a hard disk player, an MD (Mini Disc (registered trademark)) player, or portable information terminal or the like, with music data playing functions, and a method and program used in a device for playing audio. Background Art [0002] In recent years, as portable audio player which have been reduced in size and reduced in weight have become widespread, music is coming to be listened to in unprecedented situations. For example, portable audio players are being widely taken outdoors to listen to music while walking, or being used to listen to music while performing sports such as jogging, walking, or the like which are performed in order to maintain health, increase health, lose weight, and so forth. [ 0 0 3 ] In -this case, in the event that the tempo of the music being played and the tempo of the actions (for example, exercise such as walking, jogging, walking, or the like) of the user (hereafter referred to simply as action tempo or exercise tempo) match, a sense of oneness between the actions and the music can be obtained. Accordingly, a device has been conceived in which the action tempo of the user is detected and the tempo of the music being played is changed according to change in the action tempo, even in cases wherein the tempo of the music being played and the action tempo of the user become mismatched, or the action tempo of the user suddenly changes so that a sensation of oneness of the actions and music can be obtained. [0004] Note tnat in this Description, terms such as tempo of music, playing tempo of music, and tune tempo, mean the speed of music data at the time of being played, and is the number of beats per minute (BPM: Beat Per Minutes). Also, the action tempo (exercise tempo) of the user specifically is the speed of actions, and means the number of increments (single action (exercise)) of smallest measurable actions of che user per minute, such as for example, in the event that the actions (exercise) of the user are walking or running, this is che number of steps per minute, and in the event that, che actions are jumping, the number of jumps per minute. [0005] Also, disclosed in Japanese Unexamined Patent Application Publication No. 2005-156641 is a device wherein actions or walking pace are obtained from vibrations accompanying actions or step data from walking, with a detector which the user wears on the body, and the playing tempo of the music is changed in accordance with the change. Using such a device allows exercise to be continued comfortably or exercise to be efficiently performed, along with the music being played, and so forth. [ 0 0 0 6 ] Nov/, the invention described in the above-described Japanese Unexamined Patent Application Publication No. 2005-156641 is for changing the playing tempo of music being played along with the action tempo of the user, and the playing terr.po of the music can b-e constantly made to follow the action tempo of the user. However, since the playing tempo of the music being played is changed, here are cases wherein music is provided to the user of which the tempo is transient in change from beginning to end. Also, the music to be played is generally pre-composed, so it is conceivable that; there may be those thereof which are unsuitable for change in playing tempo. [ 0 C 0 7 ] Also, further increase in convenience for the user is diesired, such as not only enabling exercise to be continued in ease, but also enabling support for motivation of exercising and comprehension and management of the amount of exercise,.by enabling a oneness to be obtained between the music being played and the actions of the user at the time of performing exercise along with music being played. ';ooo8] Further, with regard to support for motivation of exercising and continuation of exercise, there is new demand for functions enabling support for motivation of exercising and continuation of the exercise not only for 1 exercise session performed in relatively short time increments such as in increments of a few minutes, or increments of several tens of minutes, or increments of several hours at the most, but rather for exercise which is preferably continued over a relatively long period, such as in increments of days, increments of weeks, increments of months, increments of years, and so forth. [0009] In light of the above, a first object of the present invention is to provide a device, method, and program for playing audio with further improved convenience, enabling music to be played such that oneness can be obtained with the actions of the user at all times, without giving'any unnaturalness such as unpleasant sensations to the user, and it: is a second object of the present invention to provide a device, method, and program for enabling support for motivation for not only 1 exercise session in 'relatively short time increments but also exercise which is preferably continued over a relatively long period, and for continuing such exercise. Disclosure of Invention L0010] In order to solve the above problems, an audio player according to the invention in Claim 1 is characterized in comprising: playing means for playing music data; sensor means for detecting change in actions of a user; detecting means for detecting an action tempo of the user at each predetermined timing following starting of playing of music data through the playing means, based on detection output from the sensor means; determining means for determining whether or not the difference between the tempo of music data being played by the playing means and the action tempo of the user detected by the detecting means is within a predetermined range; searching means for searching, in the event that determination is made by the determining means that the difference between the tempo of music data being played and the action tempo of the user is outside of the predetermined range, for music data of a tempo of which the difference as to the action tempo detected by the detecting means is the predetermined range; and changing means for changing the music data played by the playing means to the music data searched by the searching means. [0011 ] With the audio player according to the invention in Claim 1, following starting playing of music data through the playing means, at each predetermined timing, the action tempo of the user is detected by detecting means, based on detection output from the sensor means, and determination is made by the determining means regarding whether or not the difference between the detected action tempo of the user and the tempo cf the music data being played is within a predetermined range. [0012] Then, in the event that determination is made that the difference between the action tempo of the user and the tempo of the music data being played is outside of the predetermined range, the searching means search for music data of a tempo of which the difference as to the action tempo or: the user is within the predetermined range, and the music data to be played is changed by the control means such that the searched music data is played. [0013] Accordingly, the music data to be played itself can be changed in accordance with the action tempo of the user, so unlike a case wherein only the tempo is changed without changing the music data being played, music can be played such that oneness with the actions of the user can be obtained, without providing any unnaturalness whatsoever such as unpleasant sensation. ;0014] Also, an audio player according to the invention in Claim 2 is characterized in comprising: playing means for playing music data; sensor means for detecting change in actions, of a user; first detecting means for defecting action tempo of the user before playing of music data through the playing means, based on detection output from the sensor means; first searching means for searching for music data of a tempo of which the difference as to the action tempo detected by the first detecting means is within a predetermined range; playing control means for controlling the music data searched by the first searching means so as to be played through the playing means, 'second detecting means for detecting action tempo of the user at each predetermined timing in the event of playing of music data through the playing means, based on detection output from the sensor means; determining means for determining whether or not the difference between the tempo of music data being played by the playing means and the action tempo of the user detected by che second detecting means is within the predetermined range; second searching means for searching, in the event that determination is made by the determining means that the difference between the tempo of music data being played and the action tempo of the user is outside of the predetermined range, for music data of a tempo of which the difference as to the action tempo detected by the second detecting means is within the predetermined range; and changing means for changing the music data played by the playing means to the music data searched by the second searching means. [0015] With tnis audio player according to the invention in Claim 2, before playing the music data through the playing means, first, the action tempo of the user is detected through the first detecting means. Then, music data of a tempo according to the detected action tempo is searched by the first searching means, and here the searched music data is played by the playing means under control of the playing control means. [0016] Subsequently, during the period in which the music data is being played, the action tempo of the user is detected by the second detecting means at each predetermined timing, based on detection output from the sensor means, and determination is made by the determining means regarding whether or not the difference between the; action tempo of the user and the tempo of the music data being played is within a predetermined range. [0017] Then, in the event that determination is made that the difference between the action tempo of the user and the tempo of the music data being played is outside of the predetermined range, the second searching means search for music data of a tempo corresponding to the action tempo of the user, and the music data to be played is changed by the changing means such that the searched music data is played. [0018] Accordingly, during the period from the start of playing the music data to ending of playing, the music data to be played itself can be changed in accordance with the action tempo of the user, so unlike a case wherein only the tempo is changed without changing the music data being played, music can be played such that oneness with the actions of the user can be obtained, without providing any unnaturalness whatsoever such as unpleasant sensation. [0019] Also, an audio player according to the invention in Claim 13 is characterized in comprising: profile information accepting means for accepting input of personal profile information from a user; targe- exercise amount accepting means for accepting input of target exercise amount of the user; detecting means of detecting actions of the user; calculating means for calculating the actual exercise amount cf the user, based on the personal profile information of the user accepted through the profile information accepting means, and the detection output from the detecting means; selecting means for sequentially selecting music data to be played, during a period until an accumulated value of the actual exercise amount of the user calculated at the calculating means reaches the target exercise amount accepted through the target exercise amount accepting means; and playing means for playing the music data selected by the selecting means. [0020] With the audio player according to the invention in Claim 13, personal profile information of the user is accepted through the profile information accepting means, and a target exercise amount of the user is accepted through the target exercise amount accepting means. Then, the actual exercise amount of the user is calculated by the calculating means, based on the personal profile information accepted through the profile information accepting means and the actions of the user detected through the detecting means. [0021] Then, during the period until the accumulation value of actual exercise amount calculated by the calculating means reaching the target exercise amount accepted, through the target exercise amount accepting means, music data to be played is sequentially selected by the selecting means, and the selected music data is played by the playing means. :0022] Thus, curing the period until the exercise amount of exercise performed by the user reaches the input target exercise amount, music data to be played is automatically selected and this can be sequentially played, without troubling the user. Accordingly, music data is consecutively played during the period until the target exercise amount is reached, so motivation can be provided to continue exercise, and continuation of exercise can be supported. [002 3] Change in the tempo of actions (Action tempo) of exercise (walking, jogging, running, muscle training, etc.) which the user performs is detected, and tunes (music data) of a tempo corresponding to the action tempo are selected and played, thereby enabling oneness between the actions (exercise) and played tunes to be provided, without causing an unpleasant sensation. ;; o o 2 4 ] Also, by setting a target exercise amount, or setting a predetermined target exercise amount, and consecutively playing tunes until the exercise amount of the exercise which the user is performing exceeds these, or'providing privileges in the case of exceeding, motivation can be provided tc continue exercise, and continuation of exercise can be supported. Accordingly, exercise which is preferably continued can be continued. Brief Description of Drawings [0025] [Fig. 1] Fig. 1 is a block diagram for explaining an audio player to which an embodiment of a device and method, according to the present invention has been applied. [Fig. 2] Fig. 2 is a diagram for explaining an example of a representative external view which the audio player can a s sume. [Fig. 3] Fig. 3 is a flowchart for explaining operations of the audio player shown in Fig. 1. [Fig. 4] Fig. 4 is a diagram for explaining an example of an input screen for profile information of a user. [Fig. 5] Fig. 5 is a diagram for explaining an example of a tune information list (view list of music data which can be played). [Fig. 6] Fig. 6 is a diagram for explaining a display screen example while playing music data. [Fig. 7] Fig. 7 is a diagram for explaining a display example of exercise amount information displayed after playing of music data ends. [Fig. 5] Fig. 8 is a diagram for explaining an example of a played tune list (play tune history). [Fig. 9] Fig. 9 is a diagram for explaining calculation of walking distance and the like. [Fig. 10] Fig. 10 is a diagram for explaining calculation of average speed of moving when exercising. [Fig. 11] Fig. 11 is a diagram for explaining a case of obtaining out-energy using out-energy per minute. [Fig. 12] Fig. 12 is a diagram for explaining a case of obtaining out-energy using METS value which is a value indicating exercise intensity determined for each exercise. [Fig. 13] Fig. 13 is a diagram for explaining a case of obtaining the amount of fat burned. [Fig. 14] Fig. 14 is a diagram for explaining the METS value. [Fig. 15] Fig. 15 is a diagram for explaining the METS value. . [Fig. 16] Fig. 16 is a diagram for explaining a specific example of a case of obtaining out-calories. [Fig. 17] Fig. 17 is a diagram for explaining a specific example of a case of obtaining out-calories. [Fig. 18] Fig. 18 is a diagram illustrating vertical direction output of a tri-axial acceleration sensor provided as an exercise information sensor 24. [Fig. 19] Fig. 19 is a flowchart for explaining another example of the operations of the audio player. [Fig. 20] Fig. 20 is a flowchart for explaining the operations of the audio player in a case wherein tunes to be played are automatically selected during the time until the user reaches a target exercise amount. [Fig. 21] Fig. 21 is a diagram for explaining an input screen for a target exercise amount. [Fig. 22] Fig. 22 is a diagram for explaining a display example of an in-play display for a tune, displayed in a case that music data is being played. [Fig. 23] Fig. 23 is a diagram for explaining a specific example of an exercise information display. [Fig. 24] Fig. 24 is .a diagram for explaining a display examoie in a case wherein exercise information is to be shown in increments of tunes. [Fig". 25] Fig. 25 is a diagram for explaining an example of exercise/played history information. [Fig. 2 6] Fig. 2 6 is a diagram for explaining a specific example of a case for providing privileges based on exercise history information. [Fig. 27] Fig. 27 is a diagram for explaining an example of a case of providing privileges in accordance with accumulation values of exercise distance as accumulation values of exercise amount. [Fig. 28] Fig. 28 is a diagram for explaining an example of a case of providing privileges in accordance with accumulation values of exercise distance as accumulation values cf exercise amount. [Fig. 29] Fig. 29 is a diagram for explaining a calculation example in a case of easily obtaining out-energy of the user. Best Mode for Carrying Out the Invention [0026] An embodiment of the device, method, and program according to the present invention, will be described below, with reference to the drawings. With the embodiment described below, an example will be described wherein of a case wherein the device, method, and program according to the present invention have been applied to, a portable audio player (music player) such as for example, a portable hard disk player, a portable MD (Mini Disc (registered trademark)) player, or cellular telephone terminal with music data (tune data) playing functions, or the like. [0027; [Configuration and Basic Operation of Audio Player] Fig. 1 is a block diagram for explaining the audio player according to the present embodiment. As described above, the audio player according to the present embodiment is portable, reduced in size and reduced in weight, and can be casually used being carried stored in a garment pocket or the like. Accordingly, this is suitable to being used in cases of playing and listening to music while performing various types of exercise, such as walking, jogging, running, and so forth. [0028] As shown in Fig. 1, the audio player according to the present embodiment is provided with a control unit 10, a music information storage device unit 21, a music playing data generating device unit 22, an exercise information analyzing circuit 23, an exercise information sensor 24, an audio signal output processing unit 31, a speaker 32, a display circuit 33, a display unit 34, a key operating unit 4 1, a microphone (shown as a mike in Fig. 1) 42, an audio signal input processing unit 43, an external terminal 51, an I/F (interface) 52, a storage device unit 53, a communication I/F 61, a transmission/reception circuit 62, and a transmission/reception antenna 63. [0 02 9] The control unit 10 is for controlling each unit of the audio player, and is configured with a CPU (Central Processing Unit) 11, ROM (Read Only Memory) 12, and RAM (Random Access Memory) 13 connected via a CPU bus 14. Here, the CPU 11 is capable of executing programs and supplying control signals generated thereby to each component, thereby controlling each component, and is the primary entity of control. The ROM 12 is for storing and holding various types of programs to be executed by the CPU 11 and.various types of data necessary for processing, and so forth. Also, the RAM 13 is used primarily as a work region (work area), such as temporarily storing midway results of processing, and so forth. [,0030] The music information storage device unit 21 is a device portion for reading out music data recorded in recording media, and writing music data to the recording media. There are various types of recording media, sucxh as hard disks, magneto-optical discs such as 'MD (Mini Disc (registered trademark)), optical discs such as CD (Compact: Disc) and DVD (Digital Versatile Disc) and so forth, semiconductor memory, IC card memory formed using semiconductor memory, magnetic tape, and so forth, and in the case that the recording medium is a hard disk for example, the music information storage device unit 21 corresponds to a hard disk drive, and in the event that the recording nedium is an optical disc, the music information storage device unit 21 corresponds to an optical disc drive. [0031] The music playing data generating device unit 22 is for performing various types of processing regarding music data (tune data) to be played, in response to control from the control unit 10. Though specifically described later, this is a portion for performing processing such as selecting music data to be played from multiple music data stored in the music information storage device unit 21, determining the playing order of the music data to be played, and so forth. [0032] The exercise information analyzing circuit 23 is a portion which performs analysis processing and the like relating to exercise of the user, in response to control from the control unit 10 and the like. Though described later, the exercise information analyzing circuit 23 calculates how much the exercise amount will be in the event that the user performs a predetermined exercise along with music provided .by playing the music data, based on personal profile information such as the height, weight, sex, and so forth of the user, which is input via the key operating unit 41, and the properties information of the played music data, such as play time, tempo, and so forth. [0033] Also, in the event that a target exercise amount is input via the key operating unit 41, the exercise information analyzing circuit 23 also has a function to calculate the exercise intensity, exercise time (time over which the exercise is to be continued), and so forth, in the case of performing exercise of the input exercise amount. Also, the exercise information analyzing circuit 23 can calculate the actual exercise amount of the user by receiving supply of detection output from the exercise information sensor 24. [0034] Note that in Fig. 1, functions of the music playing data generating device unit 22 and the exercise information analyzing circuit 23 indicated by double-line blocks can also be realized by a program executed at the control unit 10. Accordingly, the functions of the music playing data generating device unit 22 and the exercise information analyzing circuit 23 can also be realized by the control unir. 10 functioning. [0035] The exercise information sensor 24 can, in the event that the user is exercising, detect this, or detect change in the body temperature of the user or change in the pulse, and so forth, using one or more of various types of sensors, such as an acceleration sensor, shock sensor, pressure sensor, charge potential sensor, distortion sensor, ranging sensor, current sensor, temperature sensor, or the like. As described above as well, these detection outputs are supplied to the exercise information analyzing circuit 23, and will be used for calculation of actual exercise amount and so forth. [0036] With the present embodiment, a tri-axial acceleration sensor, for example, is used as the exercise information sensor 24, arranged such that the action tempo (tempo of actions) such as walking and jogging and the like can be detected by analyzing the detection output from this acceleration sensor. Also, the arrangement is such that detection can be made regarding the type of exercise being performed, such as whether the exercise that the user is performing is walking or jogging, by analyzing the detection output from the acceleration sensor used as the exercise information sensor 24. With the audio player according to the present embodiment, the audio signal output processing unit 31 receives supply of audio data (digital data) to be played which is supplied via the control unit 10, performs D/A (Digital Analog) conversion thereof and the like, and forms analog audio signals for output. The analog audio signals from the audio signal output processing unit 31 is supplied to the speaker 32, and audio corresponding to the analog audio signals supplied thereto is output from the speaker 32. [0038] Now, though not shown in the drawings, the audio signal output processing unit 31 is configured such that an audio output terminal is connected thereto, and in the event that a headphone or earphone is connected thereto, the analog audio analog signals from the audio signal output processing unit 31 are supplied through the audio signal output terminal tc the headphone or earphone connected thereto, so that the played audio can also be listened to thorough the headphone cr earphone. Thus, in the event that a headphone or earphone is connected to the audio output terminal, the played audio is not output from the speaker 32. [0039] The display circuit 33'is for forming an image to be displayed or the display screen of the display unit 34, in response to control from the control unit 10. In this case, a display device such as, for example, an LCD (Liquid Crystal Display) or EL (Electro Luminescence) panel or the like is used for the display unit 34, and has a relatively large display screen, and is such that can display various types of information. Operating guidance, error messages, titles of played music, and other various types of text information, image information, and so forth, are displayed on the aispiay screen of the display unit 34, in response to control of the control unit 10. .[0040 ] The key operating unit 41 has multiple operating keys and function keys, and is a portion for accepting input' of instructions and information and so forth to be provided to the audio player, such as starting or ending of music playing,, selection of music to be played, personal profile information, target exercise amount, and so forth. Also, the microphone 42 picks up audio and converts this into electric signals so as to be taken in. Analog audio signals in accordance with the audio picked up by the microphone 4 2 are supplied to the audio signal input processing unit 43, and here are subjected to A/D (Analog/Digital) conversion and the like, and can be recorded in a recording medium of the music information storage device unit 21 via the control unit 10.. [0041] The external terminal (external input/output terminal) 51 is a connection terminal with external equipment, and is arranged to be capable of receiving supply of audio- data from another audio player and taking this in, or conversely supplying music data from the audio player according to the present embodiment to other external equipment, for example. Also, besides music data, programs and various types of data can also be input/output. ;0042] Note that the I/F 52 is for performing processing such as taking in data regarding which supply has been received via the external terminal into the audio player according to the present embodiment, and converting this into data of a format which can be processed, or conversely converting from data to be output to other equipment into data of an outputtable format. [0043] Though described later, the storage device unit 53 can store and hold data to be saved, for example, various types of information such as identification information of audio data that has been played, properties information of that audio data, personal profile information of the user, calculated exercise 'amount information, and so forth. Also, music data can be stored in this storage device unit 53, as a matter of course. [0044] Note that the storage device unit 53 is a storage portion for performing processing of reading out various types of data recorded in a recording medium, and writing various types of data to the recording medium, as with the above-described music information storage device unit 21. There are various types of recording media, such as hard disks, magneto-optical discs such as MD (Mini Disc (registered trademark)), optical discs such as CD (Compact Disc) and DVD (Digital Versatile Disc) or the like, semiconductor memory, IC card memory formed using semiconductor memory, magnetic tape, and so forth, ana in the case that the recording medium is a hard disk for example, the storage device unit 53 corresponds to a hard disk driver, and in the event that the recording medium is an optical disc, the storage device unit 53 corresponds to an optical disc driver. [0045] Also, the audio player according to the present embodiment has the communication I/F (interface) 61, and is arranged so as to be capable of connecting to a network 100 such as the Internet or the like, and transmitting/receiving intended music data, properties information of the music data, and so forth, for example. Also, this is arranged such that music data, properties information of the music data, and so forth, can be obtained, by connecting to a wireless LAN (Local Area Network) or the like via the transmission/reception circuit 62 or transmission/reception antenna 63, for example. [0046] The control unit 10 then controls each portion in accordance with the input of instructions from the user accepted via the key operating unit 41, and can record music data of which supply is received via the communication I/F 61, or the external terminal 51 and I/F 51, or via the transmission/reception circuit 62 and transmission/reception antenna 63, or the properties information such as total play time, tempo, genre, melody, and so forth, of the music data, in the recording medium of the music information storage device unii 21 via the control unit 10. [0047] In a normal case then, a list of music (tunes) stored and held as music data in the music information storage device unit 21 is compiled by the control unit 10, and this is displayed on the display screen of the display unit 34 via the display circuit 33, and by selecting music data to be played from the list display of music that is displayed by way of.the key operating unit 41, that music data can be played. [ 0 0 4 3 ] In this case, the control unit 10 reads out the intended music data from the music information storage device unit 21 in response to a playing instruction accepted by the key operating unit 41 including music data selection information, and supplies this to the audio signal output processing unit 31. Upon audio data being thus supplied to the audio signal output processing unit 31, output analog audio signals are formed as described above, the intended music data is played via the speaker 32 or headphone or earphone connected to the unshown external output terminal, whereby the music being output can be listened to. [004 9] With the audio player according to the present embodiment, in a case of playing music data, the action tempo of the user is detected for each predetermined timing by the functions of the exercise information sensor 24 and the exercise information analyzing circuit 23, enabling the music data to be played to be.changed to music data of a tempo corresponding to the action tempo of the user, which will be described in further detail later. [0050] Thus, cy changing the music data to be played to music data of a tempo corresponding to the action tempo of the user, instead of changing the playing tempo of the music data be played, music data corresponding to the action tempo of the user can be played without creating unpleasant sensations, the user performing exercise can feel oneness with the music data being played, and exercise can be continued comfortably and moreover efficiently. [0051] Further with the audio player of the present embodiment, in the event that music data is played in a case that personal profile information such as the weight, height, sex, age, etc., of the user has been input by way of the key operating unit 41, the exercise amount in a case of performing predetermined exercise such as walking or jogging or the like in concert with the music corresponding to the music data is calculated by the exercise information analyzing circuit 23, based on the personal profile information and the properties information of play time and tempo and the like of the played music data. At the time of ending playing of the music data or so forth, the calculated exercise amount information can be displayed on the display unit 3 4 via the display circuit 33, and thus be provided to the user. [0052] Thus, .oy easily and accurately calculating the amount of exercise which the user has performed ana enabling this to be presented to the user, motivation for continuing exercise, such as performing how much exercise while listening to music .results in how much exercise amount, and how much exercise should be performed, and so forth, can be clearly given. [0053] Also, in the case of the audio player according to the present embodiment, the exercise information sensor 24 is provided, and in the event that the fact that the user has exercised has been detected by this exercise information sensor 24, the detection output is supplied to the exercise information analyzing circuit 23, and the actual exercise amount of the user can be calculated. This actual exercise amount can also be provided to the user by displaying on the display screen of the display unit 34. [0054] Further, as another function, in the event that a target exercise amount has been input via the key operating unit 41, the necessary exercise time and exercise intensity and so forth are calculated by the functions of the exercise information analyzing circuit 23, and based on the results thereof, the music playing data generating device unit 22 selects the music data to be played, from the music data stored and. held in the music information storage device unit V 1 [0055] The playing tempo of the selected music data, the ombination of music data to be played (play order), . the number of times of play repetition of each music data, and so forth, are determined, the music data is played exactly as determined thusly, and by exercising in concert with the music being played, exercise of the target exercise amount can be performed comfortably. [0056] Also, as another function, in the event that a target exercise amount is input via the key operating unit, music data to be played can be automatically selected until the input target: exercise amount is reached. Specifically, a calorie-shuffle function is provided which automatically selects anc plays music data to be played, in the event that a target of out-calories (goal out-calories) are input for example, until the user performs exercise equivalent to the goal out-calories, which will be described later. [0057] Now, the calculation of exercise amount to be accumulated in this case basically uses the exercise amount calculated based on the detection output from the exercise information sensor 24. That is to say, as described above as well, the exercise amount calculated based on the detection output from the exercise information sensor 24, personal profile information that has been input, and attribute information such as the play time of played music data, tempo., and so forth, at the exercise information analyzing circuit 23, is used. [0058] Also, in the event that exercise has been performed, one or more of the information of identification information such as the title name of music data that has been played, play time, the number of times of playing, personal profile information, exercise amount information, and so forth, is stored and held in the storage device unit 53 as history information, whereby the stored and held information can oe analyzed after the exercise has ended. For example, storing the exercise amount information in the storage device unit 53 enables information to be obtained such as how much exercise was performed every day, how much is the total of the exercise amount, and so forth. [0059: Also, by providing entertainment such as providing privileges in the event of reaching a predetermined value for exercise amount, based on the history information such as the exercise amount information arranged to be stored and held in the storage device unit 53, motivation for performing exercise regarding which continuing over a long period is cesired, support for continuation of the exercise, and also management of the exercise amount, can be performed.. [ 0 0 60] [About the External Appearance of the Audio Player] Next, a representative example of an external appearance which the audio player according to the present embodiment can assume will be described. Fig. 2 is a diagram for explaining a representative example of an external appearance which the audio player according to the present embodiment can assume. The size of the external appearance which the audio player according to the present embodiment can assume is within around a size which can fit into a breast pocket of the user, and is a size within around a size which can fit into the palm of the hand of the user. [0061] Accordingly, the size of the audio player according to the present embodiment will be at the largest, around a size which can fit into a breast pocket of the user, as shown in A in Figr. 2 and B in Fig. 2, and in a small case will be around several sticks of chewing gum, stacked, fprmed in plate form, or slightly larger, as shown in C in Fig. 2. Of course, there is the possibility of further reduction in size, reduction in thickness, and reduction in weight, due to advance in technology. [00 62] Now, A in Fig. 2 and B in Fig. 2 each show the external appearance of the audio player according to the present embodiment in a case of being configured to be around a size which can fit into a breast pocket of the user, and an erected type used with the longitudinal direction of the audio player being the vertical direction as to the user as shown in A in Fig. 2, and a sideways type used with the longitudinal direction of the audio player being the horizontal direction as to the user as shown in B in Fig. 2, can be conceived. [0063] Now, as shown in A in Fig. 2 and B in Fig. 2, the face of the audio player facing the user (front face) has provided thereto a display screen of a display unit such as an LCD, and a key operating unit. As shown in A in Fig. 2, in the case of an erected type audio player, the key operating unit 41 is provided on the lower side portion of a display screen 34G. Of course, the positional relation between the display screen 34G and the key operating unit 41 can be inverted from that shown in A in Fig. 2. Also, in the case of an erected type audio player, the display screen 34G may be positioned at the center portion of the front face of the audio player, with the key operating unit 41 disposec divided into two portions, the upper side portion thereof and the lower side portion thereof. [0064] Also as shown in B in Fig. 2 in the case of a sideways type audio player, the key operating unit 41 is provided to the side of the display screen 34G. Of course, the positional relation between the display screen 34G and the key operating unit 41 can be inverted. That is to say, if one of the display screen 34G and the key operating unit 41 is disposed to the right side, the other will be disposed to the lefc side. Also, in the case of a sideways type audio player, the display screen 34G may be positioned at the center portion of the front face of the audio player, with the key operating unit 41 disposed divided into two portions, the right side portion thereof and the left side portion thereof -[0065] Also, as for the key operating unit 41, this may be configured, only of so-called "button keys" capable of pressing operations, as shown in A in Fig. 2, or configured also with a dial having a dial portion 41D, capable of an operation of tracing over the dial portion 4 ID with the finger or the like, ano. an operation of pressing a predetermined position on the dial portion 4 ID, as shown in B in Fie. 2. Note that the dial portion 41D may be arranged such that mechanical turning operations can be performed of the dial portion 4ID itself. [0 0 66 ] Also, in the case of an extremely small sized configuration as shown in C in Fig. 2, the key operating unit 41 cannot be provided on the front face of the audio player as shown in A in Fig. 2 and B in Fig. 2, -so an arrangement may be made wherein, as shown in C in Fig. 2, a dial capable of turning operations is provided as the key operating unit 41 on the side face portion of the audio v player. [0067] Also, as for the key operating unit 41, a so-called jog dial capable of turning operations and pressing operations, or an operating lever called a so-called joystick, or the Like, may be used. Also, in the event- that the audio player is such as shown in A in Fig. 2 and B in Fig. 2 wherein the display screen 34G of the display unit has a relatively large display region, a. touch panel may be adhered to the display screen 34G, with the key operating unit 41 being configured of the information displayed on the display screen 34G and the touch panel. [0068] Now, providing various types of key operating units described with reference to Fig. 2 enables input of various types of information, such as input of text like the name of the user and so forth, various types of numerals and symbols and so forth, moving of a cursor, selection of items, and so on. In the case of text input for example, assigning characters for each button key. enables input of text with a small number of button keys. Also, in the case of using a dial key, tracing operations of the dial portion or turning operations of the dial portion enables selection of characters, and taking a pressing operation of a predetermined button key or a pressing operation of the dial portion, as a determining operation, enables input of characters. [0069] Note that that shown in Fig. 2 is an illustration of configuration examples of external views and operating units. Accordingly, various types of sizes and shapes can be conceived for the audio player, other than those shown in Fig. 2. Also, the key operating unit is also not restricted to that shown in Fig. 2. For example, in the case of the examples shown in A in Fig. 2 and B in Fig. 2, a dial or jog dial, or bucton keys or the like may be further provided to the side; face portion. That is to say, as for the key operating unit, this maty be configured combining various types of operating units, such as button keys, dials, job dials, touch panels, joysticks, slide-type operating switches, and so forth. [0070] [About the Operations of the Audio Player in the Case of Changing Tunes to be Played in Accordance with Action Tempo (Music Playing Method)] Next, operations in the case of changing the tune to be played in accordance with the action tempo of the user with the audio player according to the present embodiment will be described with reference to the flowchart in Fig. 3. Note than the operations of the audio player according to the present embodiment will be described as necessary, making reference to an example of information displayed on the screen 34G of the display unit 34 shown in Fig. 4 through Fig. 8, and tune information indicating tunes which can be played, and an example of a played tune list which is history of played tunes. [oo71] Fig. 3 is a flowchart for explaining the operations with the audio player according to the present embodiment in a case of changing the tune to be played in accordance with the action tempo of the user. With the audio player according to the present embodiment, in the event that music data is being played, the action tempo of the user is detected at each predetermined timing, and in the event that difference between the tempo of the music data being played and the action tempo of the user is out of a predetermined range, charge can be made to music data of a tempo of which the difference as to the action tempo of the user is within the predetermined range, as explained below in detail. [0072] Upon the user of the audio player, who is to perform exercise such as walking or jogging or the like while listening to the music provided by playing the music data by way of the audio player according to the present embodiment, turning on the power of the audio player, the control unit 10 of the audio player according to the present embodiment executes the processing shown in Fig. 3, accepts input of personal profile information from the user, and obtains this (Step S101) . [0073] In this step S101, an input screen for personal profile information such as shown in A in Fig. 4 for example is displayed, and input from the user is accepted via the key operating unit 41. In the case of this example, input of personal profile information which is necessary for calculating the exercise amount of the user, such as the name, sex, age, height, weight, and so forth, of the user, is accepted, as shown in A in Fig. 4. [0074] Upon accepting input of the personal profile information, as shown in B in Fig. 4 for example, the control unit 10 displays on the screen 34G'of the display unit 34 a confirmation screen made up of the name, sex, age, height, weight, of the user, and BMI (Body Mass Index: a body volume index obtained by weight (kilograms) 4- height. (meters; to the second power) and degree of obesity calculated from the accepted height and weight, with confirmation input being reguested, and in the event of not being correct, this can also return to the input screen shown in A in Fig. 4 and correction input be performed. * Note that in Fig. 3, the processing of step S101 is shown including such correction processing of the personal profile information. [0075; Next, the control unit 10 of the audio player according to the present embodiment starts playing of arbitrary music data, (step 5102) . Here, arbitrary music data may be any of, for example, music data which the user has specified, randomly-selected music data, or music data selected according to a certain rule. [0076] Specifically, a great number of music data playable with this audio player is stored in the recording medium of the music information storage device unit 21 of the audio player according to the present embodiment, and is managed by a tune information list (view list of playable music data) made up of the tune title (title), tune tempo, length of tune (play time of entire tune), and so forth, for example, as shown in Fi.g. 5. [0077] Accordingly, in the tune playing start step of step S102, if an arrangement is made to play music data selected by the user from the tune information list shown in Fig. 5, or to play music data randomly selected from, the tune information list shown in Fig. 5 using predetermined random numbers,, or to update the number of plays of each tune in the tune information list shown in Fig. 5, those with high usage frequency can be played with priority, or conversely, those with low usage frequency can be played with priority. [0078] Note that here, while a case of playing music data stored and held in the storage medium of the music information storage device unit 21 of the audio player according to the present embodiment has been explained as an example, this is not restrictive. While explained above as well, an arrangement may be made wherein the network 100 is connected to via the communication I/F 61, intended music data from a provider server of music data existing on this network 100 is downloaded, and this is played. [0079] Also, in the processing in step S102, information regarding the music data being played, such as the tune title, artist name, genre, tempo, and so forth, of the music data being played, is displayed on the display screen 34G of the display unit 34 as shown in Fig. 6 for example, such that the user can be notified thereof. Note that in the present embodiment, information such as the artist name or genre cr the like does not exist in the tune information list shown in Fig. 5, these information can be obtained from a music database of a server device on the network based on identification information of the music data such as the tune title, or the tune information list shown in Fig. 5 may be provided with the information such as the artist name or genre or the like, with this to be used, for example. [0080] Note that the type of exercise and intensity of exercise are calculated by processing of the later-explained step S104, for example. Accordingly, with the audio player according to the present embodiment, the type of exercise and intensity of exercise are not displayed yet in the processing in step S102. [0081] The control unit 10 of the audio player according to the present embodiment controls the exercise information analyzing circuit 23 such that the exercise information analyzing circuit 23 obtains exercise information (sensor detection output) of the user via the exercise information sensor .acceleration sensor) 24 (step S103), and the exercise information analyzing circuit 23 analyzes this, thereby calculating the action tempo and the like of the user (step S104). [0082] As explained above, the exercise information sensor 24 according to the present embodiment is configured of a tri-axial acceleration sensor, with the exercise information analyzing circuit 23 detecting the cycle of peak values of the detection output (detection waveform) from the exercise information sensor 24, detecting periodicity by calculating autocorrelation of detection output, or performing frequency spectrum analysis to detect the periodicity thereof, thereby detecting the action tempo of the user. Of course, other methods may be used to detect the action tempo of the user. [0083] Also, with the present embodiment, a tri-axial acceleration sensor is used as the exercise information sensor 24, whereby the type of exercise which the user is performing can be distinguished, such as whether walking, jogging, or the like, for example, based on the magnitude of rhe vertical direction acceleration component. That is to say, while explained later in detail, it is known that between wal