Description Title of Invention INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, PROGRAM, AND INFORMATION PROCESSING SYSTEM Technical Field [0001] The present invention relates to an information processing device, an information processing method, a program, and an information processing system. Background Art [0002] In the past, when a user clicks a text or image link in a web browser or the like, a linked page is displayed as a new window or tab. When the user follows links from one page to another in the process of searching for a certain matter, it may become difficult to return to a previous page, and to reach the original goal. One of the causes thereof is that the linked page is opened as a window or tab that has the same size as the current page. On the other hand, although it is possible to display separately the linked information in a small window, the window needs to be moved and resized, for example, which requires additional work by the user. Consequently, it is desired that the user can grasp contents of the linked page to some extent before opening the linked page. [0003] For example, among the functions that the web browser has, there is a function of allowing the user to see beforehand (to preview) linked information. This is the function of displaying, for example, a linked page image as a picture image and the function of displaying information that is an overview of the page, and hence, it is not enough for the user to concretely grasp the linked information. [0004] Further, for example, there is disclosed technology of acquiring, based on a plurality of linked page addresses registered beforehand, respective linked pages, and also displaying the linked pages on respective display surfaces obtained by dividing a display surface into a plurality of parts (for example, see Patent Literatures 1 to 3). Citation List Patent Literature [0005] Patent Literature 1: JP 2007-305165A Patent Literature 2: JP 2007-317220A Patent Literature 3: JP2007-188529A Summary of Invention Technical Problem [0006] However, the function of allowing the user to see beforehand (to preview) linked information represents, for example, the function of displaying a linked page image as a picture image and the function of displaying information that is an overview of the page, and hence, there was a problem that it was not enough for the user to concretely grasp the linked information. [0007] Further, with the technologies disclosed in the above-mentioned Patent Literatures 1 to 3, additional work of dividing the screen is required for the user, and hence, there was a problem that it did not necessarily improve the convenience for the user. [0008] Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a novel and new technology which makes it possible for the user to grasp linked information by an easy operation. Solution to Problem [0009] According to an aspect of the present invention in order to achieve the above-mentioned object, there is provided an information processing device including an input section which is capable of accepting an input of information, a display section which has a display surface and is capable of displaying information on the display surface, a communication section which is capable of communicating with another device holding page information to be a source of a page displayed on the display surface, a storage section which stores information in which region information for specifying a predetermined region within the display surface is associated with a page analysis result obtained by analyzing destination page information, and a control section which causes the communication section to execute processing of acquiring source page information from the other device and also causes the display section to execute processing of displaying the source page on the display surface based on the source page information, which, in a case where a link to jump to the destination page is included within the source page, when movement information indicating that the link is moved to a predetermined position while being selected is input via the input section, determines whether or not the link is moved to the predetermined region within the display surface based on the movement information and the region information, and which, when determining that the link is moved to the predetermined region within the display surface, acquires from the storage section and causes the display section to execute processing of displaying on the source page, the page analysis result associated with the region information for specifying the predetermined region of a movement destination of the link. [0010] The predetermined region may be a region obtained by being divided by one or more lines each extending in a predetermined direction based on a position at which the link is present. The storage section may store the region information with inclusion of a direction condition indicating a direction based on a position at which the link is present. [0011] The storage section may store the page analysis result by storing, according to genre, an analysis result obtained by analyzing the destination page information. [0012] The predetermined region may be a region obtained by being divided by one or more circles each formed of a set of points positioned at a predetermined distance away from a position at which the link is present. The storage section may store the region information with inclusion of a distance condition indicating a distance based on a position at which the link is present. [0013] The storage section may store the page analysis result by storing, according to degree of importance, an analysis result obtained by analyzing the destination page information. [0014] The storage section may store the distance condition and the page analysis result in association with each other such that, with the increase in the distance, the degree of importance increases. Advantageous Effects of Invention [0015] As described above, according to the present invention, the user can grasp linked information by an easy operation. Brief Description of Drawings [0016] [Fig. 1] Fig. 1 is a diagram showing a schematic configuration of an information processing system according to a present embodiment. [Fig. 2] Fig. 2 is a diagram showing an example of a page displayed by an information processing device according to the present embodiment. [Fig. 3] Fig. 3 is a sequence diagram showing a flow of processing in the information processing system according to the present embodiment. [Fig. 4] Fig. 4 is a diagram showing an example of a page analysis result in a table. [Fig. 5] Fig. 5 is a diagram showing a functional configuration of the information processing device according to the present embodiment. [Fig. 6] Fig. 6 is a diagram showing a functional configuration of an analysis device according to the present embodiment. [Fig. 7] Fig. 7 is a diagram showing a functional configuration of a web server according to the present embodiment. [Fig. 8] Fig. 8 is a diagram showing a hardware configuration of the information processing device according to the present embodiment. [Fig. 9] Fig. 9 is a flowchart showing a flow of processing executed by a display content calculation section according to the present embodiment. [Fig. 10] Fig. 10 is a diagram showing a configuration of operation/display content correspondence information (display policy) according to the present embodiment. [Fig. 11] Fig. 11 is a diagram showing a display example of guide information. [Fig. 12] Fig. 12 is a flowchart showing a flow of processing when a user drags a link. [Fig. 13] Fig. 13 is a flowchart showing a flow of processing for displaying an information window based on a drag direction and a drag distance of the link. [Fig. 14] Fig. 14 is a diagram showing a display example of an information window. [Fig. 15] Fig. 15 is a diagram showing a state where display contents change depending on the drag distance. [Fig. 16] Fig. 16 is a diagram showing an example of displaying information-display windows by dragging links with two fingers simultaneously. Description of Embodiments [0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the appended drawings. Note that, in this specification and the drawings, elements that have substantially the same function and structure are denoted with the same reference signs, and repeated explanation is omitted. Note that the description will be given in the following order. [0018] 1. First embodiment 1-1. Schematic configuration of information processing system 1-2. Example of page displayed by information processing device 1-3. Flow of processing in information processing system 1-4. Example of page analysis result 1-5. Functional configuration of information processing device 1-6. Functional configuration of analysis device 1-7. Functional configuration of web server 1-8. Hardware configuration of information processing device 1-9. Flow of processing executed by display content calculation section 1-10. Configuration of operation/display content correspondence information (display policy) 1-11. Display example of guide information 1-12. Flow of processing when user drags link 1-13. Flow of processing for displaying information window 1-14. Display example of information window 2. Modified example of present embodiment 3. Summary [0019] <1. First embodiment A first embodiment of the present invention will be described. [0020] [1-1. Schematic configuration of information processing system] Fig. 1 is a diagram showing a schematic configuration of an information processing system according to the present embodiment. An information processing system 10 according to the present embodiment includes an information processing device 100, an analysis device 200, and, as an example of another device, a web server 300. In general, in the case where a user acquires web page information from the web server 300 via a web browser or the like executed by the information processing device 100 and views a web page, the following processing is executed. That is, the information processing device 100 accepts an operation from the user, and, in the case where the operation indicates that web page information is to be acquired, transmits a web page information acquisition request to the web server 300. When receiving the web page information acquisition request, the web server 300 sends back web page information indicated by the web page information acquisition request to the information processing device 100. When the information processing device 100 displays the web page based on the web page information acquired from the web server 300, the user can view the displayed web page. [0021] In the present embodiment, the analysis device 200 shown in Fig. 1 structuralizes information held by the web server 300 in an appropriate form and stores the information beforehand, using technology such as web mining or data mining. For example, from a structure of a The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, whilst the present invention is not limited to the above examples, of course. A person skilled in the art may find various alternations and modifications within the scope of the appended claims, and it should be understood that they will naturally come under the technical scope of the present invention. [0063] For example, in Fig. 1, the web server 300 and the analysis device 200 are each provided in physically different casing, but there is assumed a case where a first page (for example, page A) has already been analyzed by the analysis device 200. This represents the case of storing arbitrary data in a database of a unique format and providing the data by converting it into an HTML format as appropriate in response to a request, for example. In this case, the analysis device 200 also plays a role of the web server 300. Further, there may be considered a case where the analysis device 200 is eliminated and the analysis processing is performed at the web browser side of the information processing device 100. [0064] Further, Fig. 10 shows an example in which the genre is changed in accordance with the drag direction and the content level is changed in accordance with the drag distance. However, in an opposite manner, there may be considered a modified example in which the content level is changed in accordance with the drag direction and the genre is changed in accordance with the drag distance. [0065] Fig. 15 is a diagram showing a state where display contents change depending on the drag distance. In the example shown in Fig. 15, with the increase in the drag distance, the display contents of a genre become more expanded. In addition thereto, there may be considered a modified example in which, with the increase in the distance, pieces of information on larger number of genres are displayed. [0066] <3. Summary> According to the present embodiment, linked information can be displayed by an easy operation. In general, it was necessary to execute steps of opening a linked page as a new window, resizing the window, and moving the window near a link, thereby displaying the window. According to the present embodiment, the information window can be displayed only by dragging a link, and hence, the convenience is improved. In particular, when the guide information is displayed, which is for grasping what sort of information-display window is displayed in accordance with the direction and the distance, a comfortable operation can be performed. [0067] In a portable terminal, it is desirable that a desired operation is completed with less user action, due to a restricted screen size or interface, therefore, the effects of the present embodiment becomes particularly remarkable. Further, in a user interface such as a multi-touch interface, when performing a display as shown in Fig. 16, the following simple operation can be performed: links 161h and 16th are simultaneously dragged with two fingers, and information-display windows 163e and 163f are displayed. Reference Signs List [0068] 10 Information processing system 100 Information processing device 110 Input section 120 Control section 130 Storage section 131 Display content correspondence information 132 Page analysis result 133 Page information 140 Display content calculation section 150 Communication section 160 Display section 161a Link 161d Link 161b Link 162a Guide information 163b Information window 163 e Information-display window 170 Display content acquisition section 200 Analysis device 210 Control section 220 Storage section 221 Page information 222 Page analysis result 230 Analysis section 240 Communication section 300 Web server 310 Control section 320 Storage section 3 21 Page information 330 Communication section 340 Control section 400 Network CLAIMS Claim 1 An information processing device comprising: an input section which is capable of accepting an input of information; a display section which has a display surface and is capable of displaying information on the display surface; a communication section which is capable of communicating with another device holding page information to be a source of a page displayed on the display surface; a storage section which stores information in which region information for specifying a predetermined region within the display surface is associated with a page analysis result obtained by analyzing destination page information; and a control section which causes the communication section to execute processing of acquiring source page information from the other device and also causes the display section to execute processing of displaying the source page on the display surface based on the source page information, which, in a case where a link to jump to the destination page is included within the source page, when movement information indicating that the link is moved to a predetermined position while being selected is input via the input section, determines whether or not the link is moved to the predetermined region within the display surface based on the movement information and the region information, and which, when determining that the link is moved to the predetermined region within the display surface, acquires from the storage section and causes the display section to execute processing of displaying on "the source page, the page analysis result associated with the region information for specifying the predetermined region of a movement destination of the link. Claim 2 The information processing device according to claim 1, wherein the predetermined region is a region obtained by being divided by one or more lines each extending in a predetermined direction based on a position at which the link is present, and wherein the storage section stores the region information with inclusion of a direction condition indicating a direction based on a position at which the link is present. Claim 3 The information processing device according to claim 2, wherein the storage section stores the page analysis result by storing, according to genre, an analysis result obtained by analyzing the destination page information. Claim 4 The information processing device according to claim 1, wherein the predetermined region is a region obtained by being divided by one or more circles each formed of a set of points positioned at a predetermined distance away from a position at which the link is present, and wherein the storage section stores the region information with inclusion of a distance condition indicating a distance based on a position at which the link is present. Claim 5 The information processing device according to claim 4, wherein the storage section stores the page analysis result by storing, according to degree of importance, an analysis result obtained by analyzing the destination page information. Claim 6 The information processing device according to claim 5, wherein the storage section stores the distance condition and the page analysis result in association with each other such that, with the increase in the distance, the degree of importance increases. Claim 7 An information processing method performed by a control section of an information processing device including an input section which is capable of accepting an input of information, a display section which has a display surface and is capable of displaying information on the display surface, a communication section which is capable of communicating with another device holding page information to be a source of a page displayed on the display surface, a storage section which stores information in which region information for specifying a predetermined region within the display surface is associated with a page analysis result obtained by analyzing destination page information, and the control section, comprising: a step of causing the communication section to execute processing of acquiring source page information from the other device and causing the display section to execute processing of displaying the source page on the display surface based on the source page information; a step of, in a case where a link to jump to the destination page is included within the source page, when movement information indicating that the link is moved to a predetermined position while being selected is input via the input section, determining whether or not the link is moved to the predetermined region within the display surface based on the movement information and the region information; and a step of, when determining that the link is moved to the predetermined region within the display surface, acquiring from the storage section and causing the display section to execute processing of displaying on the source page, the page analysis result associated with the region information for specifying the predetermined region of a movement destination of the link. Claim 8 A program for causing a computer to function as an information processing device which includes an input section which is capable of accepting an input of information, a display section which has a display surface and is capable of displaying information on the display surface, a communication section which is capable of communicating with another device holding page information to be a source of a page displayed on the display surface, a storage section which stores information in which region information for specifying a predetermined region within the display surface is associated with a page analysis result obtained by analyzing destination page information, and a control section which causes the communication section to execute processing of acquiring source page information from the other device and also causes the display section to execute processing of displaying the source page on the display surface based on the source page information, which, in a case where a link to jump to the destination page is included within the source page, when movement information indicating that the link is moved to a predetermined position while being selected is input via the input section, determines whether or not the link is moved to the predetermined region within the display surface based on the movement information and the region information, and which, when determining that the link is moved to the predetermined region within the display surface, acquires from the storage section and causes the display section to execute processing of displaying on the source page, the page analysis result associated with the region information for specifying the predetermined region of a movement destination of the link. Claim 9 An information processing system comprising: an information processing device; and an analysis device, wherein the analysis device includes a communication section which is capable of communicating with the information processing device, a storage section which stores destination page information, an analysis section which analyzes the destination page information stored in the storage section and acquires a page analysis result, and a control section which causes the communication section to execute processing of transmitting the page analysis result acquired by the analysis section to the information processing device, and wherein the information processing device includes an input section which is capable of accepting an input of information, a display section which has a display surface and is capable of displaying information on the display surface, a communication section which is capable of communicating with another device holding page information to be a source of a page displayed on the display surface, a storage section for performing the storing, a display content acquisition - section which causes the communication section to execute processing of receiving the page analysis result from the analysis device, a display content calculation section which causes the storage section to store a page analysis result received by the communication section in association with region information for specifying a predetermined region within the display surface, and a control section which causes the communication section to execute processing of acquiring source page information from the other device and also causes the display section to execute processing of displaying the source page on the display surface based on the source page information, which, in a case where a link to jump to the destination page is included within the source page, when movement information indicating that the link is moved to a predetermined position while being selected is input via the input section, determines whether or not the link is moved to the predetermined region within the display surface based on the movement information and the region information, and which, when determining that the link is moved to the predetermined region within the display surface, acquires from the storage section and causes the display section to execute processing of displaying on the source page, the page analysis result associated with the region information for specifying the predetermined region of a movement destination of the link.