FIELD OF THE ART This invention relates to a test system for testing a mobile object itself such as a vehicle, a ship or an airplane, and a component such as an internal combustion engine used for the mobile object. BACKGROUND ART Conventionally known is, an automobile test system wherein a plurality of measurement devices are connected to a single measurement administrating device and the measurement devices are controlled by the administrating device. In addition, as shown in the patent document 1, a test automatic administrating device is arranged above the administrating device and a test schedule is determined by the test automatic administrating device. For the test system, it is possible to verifj an operation status of each measurement unit by means of a screen of a display that displays measurement data or correction information output by the measurement unit. In this case, each of the measurement data or correction information is displayed on the corresponding window respectively in every measurement unit. It is possible for an operator to conduct various sorts of setting or operation command (for example, setting a span gas concentration value, a measurement operation initiation command or the like) from an administrating device to each measurement unit by remote control. PRIOR ART DOCUMENTS PATENT DOCUMENTS Patent document 1: Japanese Unexamined Patent Application Publication No. 2005-49353 DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION However, with the conventional arrangement, since it is necessary to conduct the above-mentioned setting or operation command in every unit for measurement respectively, it becomes complicated to operate the test system using a plurality of units for measurement. In addition, when a number of the measurement unit becomes multiple, it becomes difficult to immediately grasp the operation status of each unit for measurement because a window indicating an operation status of some of the units for measurement is hidden or every single window becomes small. In addition, in case that one of the windows is displayed in, for example, a maximum size, since other windows are hidden by the maximized window, it becomes difficult to verifj the information, namely the operation status, of the device for measurement corresponding to the above-mentioned other windows at once. It is considered that these problems are common not only to the test system using the unit for measurement but also to the test system using the unit for test to test the mobile object or the component constituting the mobile object. The present claimed invention is to solve these problems and a main object of this invention is to provide a test system that can be operated flexibly by easily conducting various sorts of setting or operation commands to a plurality of units for test and that can be easily grasp the operation status of all of the units for test. MEANS TO SOLVE THE PROBLEMS More specifically, a test system in accordance with this invention is to test a mobile object such as a vehicle, a ship or an airplane, or a component of the mobile object, and is characterized by that one or a plurality of units for test used for the test and an administrating device that administrates the unit for test are comprised, and the administrating device comprises a recognizing part that recognizes an assembly of one or more units for test as a group for test and an administrating body part that conducts a predetermined batch operation command or a predetermined batch setting on every one or more designated groups for test. It is more preferable that the recognizing part recognizes an assembly of one or more groups for test as a device for test, and the administrating body part conducts the predetermined batch operation command or the predetermined batch setting on the unit for test that belongs to one or more designated devices for test. In accordance with this arrangement, since the batch operation command or the batch setting can be conduced while a systematic relation of each unit for test is grasped, it is possible to make the operation easier to understand and to prevent a selection error of the device for test. In order to make it possible to operate the system further more flexibly, it is preferable that the above-mentioned batch operation command or the above-mentioned batch setting can be conducted on except for some of the units for test that belong to the abovementioned group for test, or the above-mentioned device administration can be conducted on except for some of the groups for test or the units for test that belong to the above-mentioned device for test. As a concrete embodiment of the recognizing part represented is that comprises a memory part that stores hierarchical structure data where a device ID indicating the device for test locates in an upper hierarchy, a group ID indicating the group for test and a unit ID indicating the unit for test are positioned in this order in a lower hierarchy than that of the device ID. In order to make it possible to conduct the system administration without being tethered by a hardware configuration or in compliance with a change of a hardware configuration, it is preferable that the administrating device further comprises a receiving part that receives addition, change or deletion of the group for test or the device for test that is recognized by the above-mentioned recognizing part, and that reflects the addition, change or deletion in the memory part. More preferably represented is that the receiving part also receives a change from a predetermined unit for test to the device for test, or a change from a predetermined device for 4 test to the unit for test. In order to make it possible to share a content of the batch operation command or a content of the batch setting among the administrating body parts, it is preferable to firther comprise a communicating part that transmits a content of the batch operation command or a 5 content of the batch setting of one of the administrating body parts to the other administrating body part. As a concrete embodiment to produce the effect of this invention more conspicuously represented is that the unit for test is a unit for measurement used for measuring a gas flowing in an air intake and exhaust path of an internal combustion engine, 10 and an assembly of the units for measurement to measure a gas at a predetermined sampling 0 point arranged on the air intake and exhaust path is recognized as the group for test. In addition, a test system in accordance with this invention is a test system to test an object to be tested with a mobile object such as a vehicle, a ship or an airplane, or a component used for the mobile object being as the object to be tested, and comprises one or a 15 plurality of devices for test used for the test and a device administrating device that is connected to the devices for test in a communicable manner and that administrates the devices for test, and is characterized by that the device administrating device has a display part that obtains information output by the device for test and that displays the obtained information in an erasable manner, a switchable manner or a movable manner on a display, 2 0 and the display part preferentially displays an operation status icon whose mode changes in accordance with the operation status of the device for test irrespective of the display of the • information. In accordance with this arrangement, the display part displays the operation status icon in either case that various information output by the device for test is displayed, no 25 information is displayed or the information is moved inside of the display. Accordingly, even though a case that the information from the device for test is not displayed, or it is difficult to recognize the information because other display content overlaps the information, it becomes possible to verify under what operation status the device for test is just by verifying the operation status icon. In other words, since the display part preferentially displays the operation status icon whose mode varies in accordance with the operation status of the device for test irrespective of the display of the information, it is possible to verify the operation status of the device for test as needed during operation of the test system without any operation. "The mode changes" in this invention includes a visual change of the operation status icon by changing a shape, a size, a color, a drawing pattern or a picture, a character, a lighting state (brightness, blinking) or the like of the operation status icon displayed in the displaying part by itself or in combination. In order to improve the recognizability by displaying the operation status icon only to the device for test connected to the device administrating device, it is preferable that the device administrating device further comprises a connection operation detecting part that detects that a connection or disconnection operation to connect or disconnect the device for test is conducted, and an operation status icon is not displayed for the device for test for which the disconnection operation is detected by the connection operation detecting part. In accordance with the above-mentioned arrangement, as the device for test represented is a device for measurement used for measuring an exhaust gas of an internal combustion engine. Concretely, as the device for measurement represented is the device for measurement that is arranged in an exhaust gas path of the internal combustion engine and measures the exhaust gas flowing in the exhaust gas path. EFFECT OF THE INVENTION In accordance with this invention, since it is possible for the operator to select a plurality of units for test to conduct the batch setting while grasping the systematic relationship of each unit for test by grouping the units for test, for example, in every content of setting in a hierarchical structure, a setting operation becomes more easy to understand. In addition, since it is possible to change an objet for batch operation command or batch setting just by changing the recognition of the recognizing part, it becomes possible to operate the test system flexibly. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a pattern configuration diagram showing an overall of a test system in 5 accordance with a first embodiment of this invention. Fig. 2 is a fluid circuit diagram simply showing a gas flow channel of this embodiment. Fig. 3 is a functional block diagram of a device and an administrating device of this embodiment. 10 Fig. 4 is both a pattern diagram showing a data hierarchical structure and a screen 0 general configuration diagram showing an outline of a screen displayed when setting is batch designated. Fig. 5 is a screen configuration diagram showing an initial screen of this embodiment. 15 Fig. 6 is a screen configuration diagram displayed when a batch operation command is designated of this embodiment. Fig. 7 is an enlarged view of an operation button to issue a batch operation command of this embodiment. Fig. 8 is a setting value input screen to input a correction setting value of this 2 0 embodiment. Fig. 9 is a pattern configuration diagram of a vehicle performance test system in a accordance with a second embodiment of this invention. Fig. 10 is a functional block diagram of a device for measurement and a device administrating device of this embodiment. 25 Fig. 11 is a screen configuration diagram showing a plug-in screen of this embodiment. Fig. 12 is a screen configuration diagram showing a detailed information screen of this embodiment. Fig. 13 is a screen configuration diagram showing an enlarged operation status icon area of this embodiment. Fig. 14 is a screen configuration diagram showing a detail of an operation button of this embodiment. 5 BEST MODES OF EMBODYING THE INVENTION A first embodiment of this invention will be explained with reference to drawings, and it is a matter of course that this invention is not limited to the following embodiment. Fig. 1 schematically shows an overall view of a test system 100 in accordance with 10 this embodiment. The test system 100 is to test an engine performance of a vehicle, and ail comprises a test automatic administrating device (not shown in drawings), a dynamometer 1 connected to an internal combustion engine (EG), a plurality of analysis devices 2 and a administrating device 7 or the like. The analysis device 2 samples a gas from an air intake and exhaust path (LG) (if 15 classification is required, an air intake side is denoted by (LG(1)) and an exhaust side is denoted by (LG(2)) ) of the internal combustion engine (EG) operated by a command from the above-mentioned test automatic administrating device, measures an amount of each component such as HC, N a , CO, COz contained in the sampled gas and calculates a performance value of devices such as the internal combustion engine (EG) or a catalyst 2 0 device (C) based on the measurement value. In order to measure the amount of the component, each analysis device 2 is, as @ shown in Fig. 2, connected to a sampling pipe (LD) to sample the intake gas or the exhaust gas from the air intake and exhaust path (LG) of the internal combustion engine (EG). A point (a sampling point), where the sampling pipe (LD) is connected, on the air intake and 25 exhaust pipe (LG) is set at a point, for example, before and after the internal combustion engine (EG), before and after the catalyst device (C) or a terminal part of the exhaust path (LG(2)). In Fig. 2, a code (LS) indicates a span gas introducing pipe to introduce the span gas for correction, a code (LZ) indicates a zero gas introducing pipe to introduce a zero gas for correction, and a code (V) indicates a valve to switch the gas. The sampled gas is, as shown in Fig. 2, introduced into one or more analysis units 21 of each analysis device 2 and a concentration of a predetermined component is measured. In case that there is necessity of classifiring the analysis devices 2, a parentheses is put. The analysis unit 21 is, for example, an FID to measure THD, a CLD to measure 5 NO,, or an NDIR to measure CO, COz, and comprises a sensor 2 la and its peripheral devices to measure a single gas component or the same kind of a gas component. The analysis unit 21 corresponds to a unit for test or a unit for measurement in claims. Furthermore, the analysis device 2 has a local computer. The local computer comprises, a CPU, a memory, an A/D converter and a communication interface, not shown in 10 drawings. As shown in Fig. 3, the local computer produces both a function as a calculating part 26 that provides a predetermined calculation on a detected value output by the sensor 2 la of each analysis unit 21, calculates a measurement value indicating each component amount and calculates the device performance value based on the measurement value, and a function as a communicating part 22 that transmits the measurement value or the device performance 15 value calculated by the calculating part 26 to the administrating device 7 through a predetermined protocol by cooperating the CPU and its peripheral devices based on the programs stored in the memory. The local computer may be provided for each of the analysis devices 2 respectively, or a single local computer may be provided for a plurality of analysis devices 2. In this embodiment, the local computer acts with a device, to be 2 0 described later, as a unit. The local computer hrther comprises a control part 23 that receives a command @ signal from the administrating device 7 and controls the valve (V), the temperature adjusting mechanism 21 b, and the pump 21c so as to control an operation mode (a measurement mode, a correction mode, a purge mode or the like), or a state mode (a sleep mode, a pose mode, a 25 standby mode or the like) of the analysis device 2, a correcting part 24 that provides a correction on the measurement value by the calculating part 26 or an arithmetic expression for measuring the performance value so as to correct the sensor 21% or a local accumulating part 25 that sequentially obtains state information of the analysis device 2 ranging from the past to the present and accumulates the obtained state information. The administrating device 7 is configured by installing predetermined programs on, for example, a general purpose computer, and comprises a CPU, a memory, a display, an input device (a keyboard or a mouse) and a communication interface. As shown in Fig. 3, the administrating device 7 produces functions as a receiving part 71, a display part 72, an 5 administrating body part 73, a communication part 74 and a memory part 75 by cooperating the CPU and its peripheral devices based on programs stored in the memory. A communication port is provided for the administrating device 7, and the analysis device 2 is connected to the administrating device 7 in an inter-communicable manner by wire or wireless. 10 In the memory part 75 stored is data that is classified into a group (corresponds to a group for test in claims) consisting of one or more analysis units 21 and a device a (corresponds to a device for test in claims) consisting of one or more groups with the analysis unit 21 as the smallest unit. More specifically, as schematically shown in Fig. 4, in this memory part 75 stored 15 is a tree structured hierarchy structure data where a device hierarchy to which a device ID indicating the device belongs, in a lower level hierarchy of which a group hierarchy to which a group ID indicating the group belongs and in a lower level hierarchy of which a unit hierarchy to which a unit hierarchy to which a unit ID indicating the unit belongs are formed. Fundamentally, a single analysis device 2 corresponds to a single device, and a 20 group locating in a lower level of the hierarchy of the analysis device 2 comprises one or more analysis units, however, since the group and the device are classified arbitrarily from the viewpoint of usability for a user, control or functionality, there are some cases wherein the group and the device do not correspond one-to-one in a physical layout. More specifically, there is a case that a plurality of devices correspond to a single analysis device 2, or a single 2 5 device corresponds to a plurality of analysis devices 2. In addition, its variation ranges over variously such that there is a case that a single group comprises a plurality of analysis units 21 each of which belongs to a plurality of different analysis devices 2. However, this embodiment makes it condition that each of the group and the device is of a physical layout that can act independently as a unit (for example, a pump is comprised and the gas can be sampled independently or the like). Furthermore, in this embodiment, the analysis units 21 that act for a common purpose are set as one group. The common purpose is, for example, a component analysis of an exhaust gas at a predetermined sampling point of the air intake and exhaust path (LG), 5 or a measurement of a predetermined performance (for example, an EGR ratio, an exhaust gas flow rate or the like) of the internal combustion engine (EG). Concretely, for example, a family of analysis units that measure a gas flowing in an terminal end part (tail pipe) of the exhaust path (LG(2)) is registered in the memory part 75 as a "Tail Pipe" group. Speaking in relationship with the physical devices, the analysis device 10 2(1) and the analysis device 2(2) in Fig. 1 belong to the "Tail Pipe" group. Other example is that a family of the analysis units connected to the upstream of the 0 catalyst device (C) is registered in the memory part 75 as a "Pre CAT' group. Speaking in relationship with the physical devices, the analysis device 2(3) in Fig. 1 belongs to the "Pre CAT' group. Since the gas sampled from the upstream of the catalyst device (C) is also 15 introduced into the analysis unit that is a part of the analysis device 2(1), a part of the analysis device 2(1) belongs to the "Pre CATy group. Furthermore, for example, a family of the analysis units that measures a gas sampled in an upstream and a downstream of the internal combustion engine (EG) is registered in the memory part 75 as an "EGR" group. Speaking in relationship with the 2 0 physical devices, the analysis device 2(4) in Fig. 1 belongs to the "EGR" group (expressed as "group 1" in Fig. 6, to be described later). • In this embodiment, a unit of the device and the group is not necessarily the analysis unit, and a device used for measurement, for example, although not shown in drawings, an operation unit (PSU, ESU, CSU or the like) of CVS that conducts a 2 5 preprocessing of the measurement is also configured as the unit. In addition, in this embodiment, as shown in Fig. 4, an administrating device hierarchy is provided in an upper hierarchy of the device hierarchy, and an integrated administrating device hierarchy is provided in a further upper hierarchy of the administrating device hierarchy. This is based on a physical configuration wherein a plurality of administrating devices 7 are administrated by the integrated administrating device. Next, an operation of the test system 100 having the above-mentioned arrangement in case that a predetermined operation is batch-commanded or a predetermined setting is batch-conducted on the analysis device (or the device) by the use of the administrating device 5 7 will be explained. First, the batch operation command will be explained, however, an initial screen as being a precondition of the batch command is displayed. A screen (hereinafter also called as a plug-in screen) 8A as shown in Fig. 5 is displayed as the initial screen on the display 7a of the administrating device 7 by the function of the display part 72. A plurality of device 10 signs 81 indicating the preliminary registered devices are arranged so as not to be overlapped * each other. Each of the device signs 81 is in a rectangular shape, and a connection button 82 to be connected to the device, a disconnection button 83 to disconnect the connection of the device and a connection state indicating area 84 to indicate a state of connection are provided in addition to a schematic view indicating a pertinent device. 15 When an operator clicks, for example, the connection button 82 on the plug-in screen 8A, exchange of a communication with the communicating part 22 of the pertinent device is initiated. If a predetermined protocol is terminated in an orderly manner and an inter-communicable connecting state is established, a "Connected" indicating a state of being connected in a communicable manner is displayed in the connection state display area 84 in 2 0 the pertinent device sign 8 1. Meanwhile, when the disconnection button 83 is clicked in this connected state, the exchange of the communication with the pertinent device is blocked and a "Stopped" indicating a state that the connection is released is displayed in the connection state display area 84. 25 As mentioned, when the necessary device is connected to the administrating device 7 in a communicable manner and a predetermined operation is executed, the display part 72 displays a detailed information display screen 9A as shown in Fig. 6 on the display 7a. The detailed information display screen 9A displays the measurement data of the device or varieties of information in an operating mode (a measurement mode, a correction mode, a purge mode or the like) or a state mode (a sleep mode, a stand-by mode or the like). In this detailed information display screen 9A, a device panel window 9 that displays the correction data or the measurement data corresponding to varieties of information output from each device is displayed by a graph or a numerical value by the 5 display part 72, and an operation status icon 11 is displayed in an operation status icon area 10 arranged on the lower side of the display part 72. A pull-down menu 15 to select the group that belongs to this device is arranged in the display panel window 9, and the measurement data from each analysis unit 21 that belongs to the group selected in the pull-down menu 15 is displayed. The displayed mode 10 can be switched to the graph or the numerical value by clicking a display mode switch button 12. A plurality of operation buttons 14 are arranged in the lower side of the device panel window 9. When the operator clicks either one of the operation buttons 14, the receiving part 71 receives the operation and the administrating body part 73 specifies each 15 analysis unit 21 that belongs to the group selected in the device panel window 9 by referring the memory part 75, and an operation indicated by a design of the operation button 14 is batch-designated to each analysis unit 2 1. Detail of the operation button 14 is shown in Fig. 7. When the operation button 141 indicated in "Span" is clicked, an operation of introducing a span gas is designated to the 2 0 device or the group for measurement indicated in the corresponding device panel window 9. Similarly, in case of the operation button 142 of "Zero", the zero gas is introduced. In case of the operation button 143 of "CAY, an operation of executing a calibration is designated based on the measurement result of the introduced span gas and the zero gas. In case of the operation button 144 of "Purge", an operation of executing cleaning up the gas in the device 2 5 is designated. In case of the operation button 145 of "Measure", an operation of executing the measurement of the sampled gas is designated. In case of the operation button 146 of "Stop", an operation of ceasing the measurement is designated. An object of the batch operation command can be selected from the pull-down menu 15. More specifically, not only the group but also the device arranged in the upper hierarchy of the group, and the administrating device and the integrated administrating device arranged in the further upper hierarchy can be selected, and also the object can be selected by a unit of the analysis unit 2 1. When the operation of selection is conducted, the operation to all of the analysis units 21 in the lower hierarchy is designated based on the hierarchy data 5 stored in the memory part 75. Although not shown in drawings, either of the unit, group and device may be removed among the object to be batch-designated by the operation of the operator. Next, an operation of the batch-setting will be explained with an example of the setting operation in accordance with the span correction. 10 As shown in Fig. 2, in case of the span correction, first a span gas supply source (B) (a steel bottle or a syringe) whose concentration is known is connected to the span gas @ introducing pipe (LS) by operating an valve (Va) or the like. Since the concentration of the span gas of the span gas supply source (B) is slightly different in every individual product in spite of the same kind, it is necessary for the operator 15 to input an accurate concentration described on the span gas supply source (B) into the administrating device 7every time the span gas supply source (B) is exchanged. Then, the operator conducts an appropriate operation so that the administrating device 7 displays the correction setting screen A1 shown in Fig. 8. Sections R2 and Rl to input the kind of the span gas and the concentration of the span gas are provided, and a shift 2 0 button B 1 to shift the screen to a batch designation screen A2 to designate the analysis device 2 to be batch-set is provided for this correction setting screen Al. @ A diagram indicating a hierarchical structure stored in the memory part 75, as shown in, for example, Fig. 4, is illustrated together with the group ID or the device ID on the batch designation screen A2. 25 Then, when the operator operates to designate an ID (for example, the group A1 in this embodiment) of an arbitrary group, the analysis unit 21 that belongs to the group, in other words, resulting in that all of the analysis units 21 locating in the hierarchical structure lower than the group are selected. In addition, when the ID (a section of the "administrating device (A)" in this embodiment) of the relevant administrating device is designated by being clicked, the group, in other words, all of the analysis units 21 administrated by the administrating device 7 are selected and a display of the selected part changes to be distinguishable from others. In addition, when the ID section (a section of "DB" in this embodiment) of the integrated administrating device is selected, all of the analysis units 21 5 are selected. With this state kept, when a decision button, not shown in drawings, is clicked, the receiving part 71 receives the span gas concentration as being its set content together with the group designation, and the administrating body part 73 batch-transmits the span gas concentration to the device (or the analysis device 2) including each of the selected analysis 10 units21. The local computer of the measurement device (or the analysis device 2) that @ receives the span gas concentration and the command corrects the value of the span gas concentration used for correction or the correction formula for computation using the value of the span gas concentration used by the correcting part 24 and stores the corrected value or the 15 corrected formula for computation in the local accumulating part 25. The above-mentioned is the setting operation. Furthermore, in this embodiment, it is possible to designate the group other than the group designated in the above-mentioned batch designation screen shown in Fig. 4, and it is also possible to cancel a designation of the device that belongs to the designated group or the group in the lower hierarchy. For 20 example, in the hierarchical structure drawing displayed in the batch designation screen, when a predetermined operation is conducted so as to connect a group and a line that is connected to the group, a batch setting to the group and the device connected to the line can be conducted. When a predetermined operation is conducted so as to disconnect a line in the designated group, no batch setting is conducted for the group or the device after the 2 5 disconnected line. It is a matter of course that it is possible to conduct not only the span setting but also a setting of the quality check item or a setting of a quality check period such as an operation of the analysis device 2, or a setting of an allowable operation hours of a component constituting the analysis device 2 by batch. At this time, grouping or a hierarchical structure accompanying the grouping may be made different for each setting content. The present claimed invention is not limited to the above-mentioned embodiment. For example, the group or the hierarchical structure is not limited to a unit of the 5 administrating device 7. For example, the analysis units 2 1 of the same kind incorporated in different administrating devices 7 may be set as one group in view of the administration. The display mode of the screen may be variously modified, and the above-mentioned correction setting screen and the batch designation screen may be displayed simultaneously on the display. In addition, this test system may be applied to a test of, for example, a 10 vehicle, and may be used for a test of an airplane or a ship, or its devices. As an object to be e set is not limited to the analysis device 2 (device for test). In case that there are a plurality of devices of the same k i d to be the object to be tested, the specification of the devices may be set by batch. The present claimed invention may be variously modified without departing from the spirit of the invention. 15