Patent Publication Number: US-2015077310-A1

Title: Image display apparatus, information processing apparatus, information processing method, program, and information processing system

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Japanese Priority Patent Application JP 2013-191346 filed Sep. 17, 2013, the entire contents of which are incorporated herein by reference. 
     BACKGROUND 
     The present disclosure relates to an information processing system, an information processing apparatus, an information processing method, a program, and an image display apparatus capable of controlling a system including a plurality of arrayed apparatuses such as a multi-display system. 
     According to Japanese Patent Application Laid-open No. 2012-83403, a multi-screen display apparatus is in widespread use. According to a multi-screen display apparatus, a plurality of monitors (unit monitors) are arranged in a matrix, and one image is displayed as a whole. According to the technology disclosed in Japanese Patent Application Laid-open No. 2012-83403, the positions of a plurality of unit monitors arranged in a matrix may be determined without depending on operations input by a user (Japanese Patent Application Laid-open No. 2012-83403, paragraphs [0002], [0008], etc.). 
     As shown in FIG. 3A of Japanese Patent Application Laid-open No. 2012-83403, a signal sender  204  is provided on each of four side surfaces of a unit monitor  110 . The signal senders  204  send determination signals to the four unit monitors  110  adjacent in four directions, respectively. Moreover, a signal receiver  206  is provided on each of the four side surfaces of the unit monitor  110 . The signal receiver  206  receives a determination signal sent from another unit monitor  110 . The positions of the plurality of unit monitors  110  are determined based on the determination signals received by the signal receivers  206  (Japanese Patent Application Laid-open No. 2012-83403, paragraphs [0023], [0024], [0060], etc.). 
     SUMMARY 
     It is desirable to provide a useful technology capable of managing the positional relation of a plurality of apparatuses, which are arrayed in use, in a system such as the above-mentioned multi-screen display apparatus. 
     In view of the above-mentioned circumstances, it is desirable to provide a useful information processing system, information processing apparatus, information processing method, program, and image display apparatus capable of managing the arrangement status of a plurality of apparatuses. 
     According to an embodiment of the present technology, there is provided an image display apparatus including a display unit, a plurality of adjacent portions, senders, and a receiver. 
     The display unit is capable of displaying an image. 
     The plurality of adjacent portions are arranged on the display unit at a predetermined positional relation. 
     The senders are capable of sending data via near field communication, the senders being arranged on at least two of the plurality of adjacent portions, respectively. 
     The receiver is capable of receiving data via the near field communication from a sender of another image display apparatus, the receiver being arranged on at least one of the plurality of adjacent portions. 
     According to the image display apparatus, a display unit includes a plurality of adjacent portions. Moreover, the senders and the receiver capable of establishing near field communication are arranged on the plurality of adjacent portions. With this configuration, the receiver is capable of receiving data via near field communication from a sender arranged on an adjacent portion of another image display apparatus. As a result, it is possible to manage the arrangement status of the plurality of image display apparatuses based on pieces of data received by each receiver. 
     Each of the senders may be capable of sending the data within an area including a vicinal adjacent portion, the vicinal adjacent portion being an adjacent portion in the vicinity of the sender out of a plurality of adjacent portions of the other image display apparatus. In this case, the receiver may be capable of receiving data from the sender of the other image display apparatus within the area including the vicinal adjacent portion, the sender being arranged on the vicinal adjacent portion. 
     According to the image display apparatus, each sender or receiver is capable of establishing near field communication within an area including a vicinal adjacent portion. The receiver receives data from a sender arranged on a vicinal adjacent portion in the vicinity of the adjacent portion on which the receiver is arranged. It is possible to determine, based on pieces of data received by each receiver, the image display apparatus including the vicinal adjacent portion on which the sender is arranged, and the position of the other image display apparatus that the adjacent portion corresponds to. As a result, it is possible to calculate and manage the arrangement status of a plurality of image display apparatuses. 
     The display unit may be a polygon. In this case, each of the plurality of adjacent portions may be a vertex portion of the polygon. In this case, it is possible to reduce a burden of setup of a plurality of adjacent portions. 
     The display unit may be a rectangle. In this case, the senders may be arranged on four corners, the four corners being the plurality of adjacent portions. Moreover, the receiver may be arranged on at least a predetermined first corner out of the four corners. 
     As described above, the receiver may be arranged on the predetermined first corner, and the arrangement status may be calculated. 
     The receiver may be at least arranged on each of the first corner and a second corner out of the four corners, the second corner being diagonal from the first corner. 
     As described above, the receivers may be arranged on the first and second corners, and the arrangement status may be calculated. 
     The receiver may be arranged on each of the four corners. 
     As described above, the receivers may be arranged on the four corners, and the arrangement status may be calculated. 
     The display unit may be a rectangle. In this case, the receiver may be at least arranged on a predetermined first corner out of four corners, the four corners being the plurality of adjacent portions. Moreover, the senders may be arranged on two corners out of three corners excluding the first corner out of the four corners. 
     As described above, the receiver may be arranged on the predetermined first corner, and the sender may be arranged on two other corners. With this configuration, also, it is possible to calculate the arrangement status. 
     The display unit may have its top and bottom in use, and the tops of the display units of the image display apparatus and the other image display apparatus may come to the upper side, and the bottoms come to the lower side. 
     If the display unit is arranged upside down, it is possible to detect the arrangement error based on data received by each receiver. 
     The display unit may have a long-side direction and a short-side direction, the display unit being capable of being used right side up and upside down, the short-side direction being a vertical direction. In this case, the receiver may be arranged on each of the first and second corners. 
     As described above, even if the display screen is capable of being used right side up and upside down, it is possible to calculate the arrangement status. 
     The image display apparatus may further include a detector capable detecting an arrangement direction. 
     As a result, it is possible to calculate the arrangement status based on orientation information easily. 
     The senders may be RFID (Radio Frequency IDentification) tags, and the receiver may be an RFID reader. 
     The configuration of an RFID tag or a reader is relatively simple, and costs for components are low. Because of this, it is possible to prevent the configuration of a unit apparatus from being complicated, and to reduce costs. 
     According to an embodiment of the present technology, there is provided an information processing apparatus capable of controlling at least part of operations of a plurality of unit apparatuses, each of the plurality of unit apparatuses including a plurality of adjacent portions, senders, and a receiver. 
     The plurality of adjacent portions have a predetermined positional relation. 
     The senders are capable of sending data via near field communication, the senders being arranged on at least two of the plurality of adjacent portions, respectively. 
     The receiver is capable of receiving data via the near field communication from a sender of another unit apparatus, the receiver being arranged on at least one of the plurality of adjacent portions. 
     The information processing apparatus includes a data receiver and a calculator. 
     The data receiver is configured to receive the data, the receiver of each of the plurality of unit apparatuses receiving the data from the sender via the near field communication. 
     The calculator is capable of calculating an arrangement status of the plurality of unit apparatuses based on the received data. 
     The information processing apparatus is capable of calculating and managing the arrangement status of the plurality of unit apparatuses based on data received by the receiver of each unit apparatus. 
     Each of the senders of each of the plurality of unit apparatuses may be capable of sending the data via the near field communication within an area including a vicinal adjacent portion, the vicinal adjacent portion being an adjacent portion in the vicinity of the sender out of a plurality of adjacent portions of the other unit apparatus. 
     The receiver of each of the plurality of unit apparatuses may be capable of receiving data from the sender of the other unit apparatus via the near field communication within the area including the vicinal adjacent portion, the sender being arranged on the vicinal adjacent portion. In this case, the information processing apparatus may further include a determining unit. 
     The determining unit is capable of determining the other unit apparatus including the vicinal adjacent portion on which the sender is arranged based on the data received by the data receiver, the vicinal adjacent portion being in the vicinity of the adjacent portion on which the receiver is arranged, and determining a position of the vicinal adjacent portion on which the sender is arranged out of the plurality of adjacent portions of the other unit apparatus. 
     The calculator may be capable of calculating an arrangement status of the plurality of unit apparatuses based on a determination result of the other unit apparatus including the vicinal adjacent portion determined by the determining unit, and based on a determination result of the position of the vicinal adjacent portion determined by the determining unit. 
     The determining unit of the information processing apparatus is capable of determining, based on pieces of data received by each receiver, the image display apparatus including the vicinal adjacent portion on which the sender is arranged, and the position of the other image display apparatus that the adjacent portion corresponds to. It is possible to calculate and manage the arrangement status of a plurality of image display apparatuses based on the determination results. 
     Each of the plurality of unit apparatuses may have its top and bottom in use, and the tops of the plurality of unit apparatuses may come to the upper side, and the bottoms come to the lower side. In this case, the information processing apparatus may further include a detector. 
     The detector is capable of detecting an upside-down unit apparatus out of the plurality of unit apparatuses based on the determination result determined by the determining unit. 
     With this configuration, it is possible to detect an arrangement error, wrong arrangement, and the like promptly. 
     Each of the plurality of unit apparatuses may include a detector capable detecting an arrangement direction. 
     In this case, the calculator may be capable of calculating an arrangement status of the plurality of unit apparatuses based on the arrangement direction of each of the plurality of unit apparatuses detected by the detector. 
     As described above, the orientation of each unit apparatus may be calculated. It is possible to calculate the arrangement status easily based on the orientation information. 
     According to an embodiment of the present technology, there is provided an information processing method executed by a computer capable of controlling at least part of operations of the plurality of unit apparatuses, the information processing method including: 
     receiving the data, the receiver of each of the plurality of unit apparatuses receiving the data from the sender via the near field communication; and 
     calculating an arrangement status of the plurality of unit apparatuses based on the received data. 
     According to an embodiment of the present technology, there is provided a program, causing a computer to process information, the computer being capable of controlling at least part of operations of a plurality of unit apparatuses, the program causing the computer to execute the steps of: 
     receiving the data, the receiver of each of the plurality of unit apparatuses receiving the data from the sender via the near field communication; and
 
calculating an arrangement status of the plurality of unit apparatuses based on the received data.
 
     According to an embodiment of the present technology, there is provided an information processing system including: a plurality of unit apparatuses; and a control apparatus capable of controlling at least part of operations of the plurality of unit apparatuses. 
     Each of the plurality of unit apparatuses includes a plurality of adjacent portions, a sender, and a receiver. The plurality of adjacent portions have a predetermined positional relation. 
     The senders are capable of sending data via near field communication, the senders being arranged on at least two of the plurality of adjacent portions, respectively. 
     The receiver is capable of receiving data via the near field communication from a sender of another unit apparatus, the receiver being arranged on at least one of the plurality of adjacent portions. 
     The control apparatus includes a data receiver and a calculator. 
     The data receiver is configured to receive the data, the receiver of each of the plurality of unit apparatuses receiving the data from the sender via the near field communication. 
     The calculator is capable of calculating an arrangement status of the plurality of unit apparatuses based on the received data. 
     As described above, according to the present technology, it is possible to provide a useful information processing system, information processing apparatus, information processing method, program, and image display apparatus capable of managing the arrangement status of a plurality of unit apparatuses. Note that the above-mentioned effects are not necessarily be attained, but any effect described in the present disclosure may be attained. 
     These and other objects, features and advantages of the present disclosure will become more apparent in light of the following detailed description of best mode embodiments thereof, as illustrated in the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram schematically showing a configuration example of an image display system according to a first embodiment; 
         FIG. 2  is a functional block diagram illustrating an image display apparatus, which is configured to send and receive tag information; 
         FIG. 3  is a block diagram schematically showing a configuration example of hardware of an integration control apparatus; 
         FIG. 4  is a block diagram schematically showing a functional configuration example of the integration control apparatus; 
         FIGS. 5A and 5B  are diagrams illustrating process of calculating an arrangement status by the integration control apparatus; 
         FIGS. 6A and 6B  are diagrams each schematically showing an arrangement example in which an overall shape is not rectangular; 
         FIG. 7  is a diagram showing a state where an image display apparatus is arranged upside down; 
         FIGS. 8A and 8B  are diagrams each schematically showing an image display apparatus or image display apparatuses of a second embodiment; 
         FIGS. 9A and 9B  are diagrams each illustrating an arrangement example, in which each image display apparatus includes one reader; 
         FIGS. 10A and 10B  are diagrams each illustrating an arrangement example, in which each image display apparatus includes one reader; 
         FIG. 11  are diagrams each illustrating an arrangement example, in which each image display apparatus includes one reader; 
         FIGS. 12A and 12B  are diagrams showing a state where an image display apparatus is arranged upside down; 
         FIG. 13  is a diagram schematically showing an arrangement status according to an example of a third embodiment; 
         FIG. 14  is a flowchart showing the flow of calculation of an arrangement status according to this embodiment; 
         FIG. 15  is a flowchart showing the flow of check_grid(cur); 
         FIGS. 16A and 16B  are diagrams showing arrangement statuses having the positional relation of  FIG. 13  and having different orientations as a whole; 
         FIGS. 17A and 17B  are diagrams each illustrating grids adjacent to each other in this embodiment and an example of a method of determining their orientations; 
         FIGS. 18A and 18B  are diagrams each illustrating grids adjacent to each other in this embodiment and an example of a method of determining their orientations; 
         FIG. 19  is a diagram schematically showing an arrangement status according to a fourth embodiment of the present technology; 
         FIG. 20  is a diagram schematically showing an arrangement status according to a fifth embodiment of the present technology; and 
         FIGS. 21A ,  21 B, and  21 C are diagrams each schematically showing an arrangement status according to a sixth embodiment of the present technology. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. 
     First Embodiment 
     [Configuration of Image Display System] 
       FIG. 1  is a diagram schematically showing a configuration example of an image display system, i.e., an information processing system, according to a first embodiment of the present technology. An image display system  100  includes a plurality of image display apparatuses  10  and an integration control apparatus  50 . The integration control apparatus  50  is capable of controlling at least part of operations of the plurality of image display apparatuses  10 . Each of the plurality of image display apparatuses  10  connects to the integration control apparatus  50 , and they are capable of communicating with each other. 
     Each of the plurality of image display apparatuses  10  may connect to the integration control apparatus  50  in any mode, in any method, and the like. Each of the plurality of image display apparatuses  10  may connect to the integration control apparatus  50  wirelessly or wiredly. Moreover, for example each of the plurality of image display apparatuses  10  may connect to the integration control apparatus  50  via a network such as a LAN (Local Area Network) or a WAN (Wide Area Network). Alternatively, an arbitrary configuration for connection may be employed. 
     The plurality of image display apparatuses  10  are capable of being used where they are arranged two-dimensionally. If the plurality of image display apparatuses  10  are arranged two-dimensionally, it is possible to display an image on a large screen. In this embodiment, the plurality of image display apparatuses  10  are image display apparatuses of the same kind having the same function. Alternatively, the plurality of image display apparatuses  10  may be image display apparatuses of different kinds having different functions. In this embodiment, the plurality of image display apparatuses  10  correspond to “a plurality of unit apparatus”. 
     As shown in  FIG. 1 , each image display apparatus  10  is rectangular seen in the front direction. Moreover, the image display apparatuses  10  have the same size. The image display apparatus  10  includes a display unit  25  capable of displaying an image. The display unit  25  includes a display screen  11  and a frame  12 . The frame  12  is a rim surrounding the rim of the display screen  11 . The shape of the display unit  25  is the outer shape of the image display apparatus  10 . In other words, in this embodiment, the display unit  25  is rectangular. 
     Typically the shape of the display unit  25  is determined by the shape of the frame  12 . For example if an arbitrarily polygonal frame  12  is mounted on the rim of the rectangular display screen  11 , the display unit  25  is a polygon. The shape of the display screen  11  may be similar to or different from the shape of the frame  12 . Note that the frame  12  is not necessarily arranged so that the frame  12  may surround the entire display screen  11 . 
     The image display apparatus  10  includes a built-in controller (not shown). The controller includes for example a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. A controller program is stored in the ROM. The CPU loads the controller program in the RAM, and executes the controller program. As a result, the CPU controls mechanisms of the image display apparatus  10 . For example in response to an instruction from the integration control apparatus  50 , a partial image in a large image is displayed on the display screen  11 . The configuration of the controller is not limited. The controller may have any arbitrary hardware and software. Alternatively, an arbitrary configuration for displaying an image may be used. 
     Moreover, the image display apparatus  10  includes a plurality of adjacent portions  13 , RFID (Radio Frequency Identification) tags  14  (hereinafter simply referred to as tags  14 ), and RFID readers  15  (hereinafter simply referred to as readers  15 ). The tags  14  function as senders, and are arranged on the plurality of adjacent portions  13 , respectively. The readers  15  function as receivers, and are arranged on the plurality of adjacent portions  13 , respectively. 
     The plurality of adjacent portions  13  and the display unit  25  have a predetermined positional relation. Typically, four corners  16  of the rectangular frame  12  are determined as the plurality of adjacent portions  13 . The four corners  16  includes a lower-right corner  16   a , a upper-right corner  16   b , a lower-left corner  16   c , and the upper-left corner  16   d  having a predetermined positional relation. It is possible to determine the positional relation of the adjacent image display apparatuses  10  based on the adjacent corners  16 . 
     The plurality of adjacent portions  13  may be different from the four corners  16  as long as it is possible to determine the positional relation of the image display apparatuses  10 . For example center portions of four sides  17  of the frame  12  may be used as the plurality of adjacent portions  13 , respectively. The plurality of adjacent portions  13  may be at other positions. 
     Note that if the outer shape (shape of display unit  25 ) of the image display apparatus  10  is a polygon seen in the front direction, vertex portions of the polygon may be determined as the plurality of adjacent portions  13 . The vertex portion means a portion in the vicinity of each vertex. With this configuration, it is possible to reduce a burden when setting the plurality of adjacent portions  13 . Note that a polygon includes not only a sharply-angled polygon but also a rather obtuse-angled polygon and a polygon having round corners. 
     The tag  14  and the reader  15  are arranged on each corner  16  where a predetermined area is a communicable area O. With reference to the lower-right corner  16   a  of the image display apparatus  10 A of  FIG. 1 , the communicable area O will be described. The image display apparatuses  10 B to  10 D are arranged around the image display apparatus  10 A, and have the corners  16 , respectively. The corners  16  in the vicinity of the lower-right corner  16   a  of the image display apparatus  10 A are referred to as vicinal corners (vicinal adjacent portions)  18 , where the image display apparatuses  10 A to  10 D are two-dimensionally arranged. In the example of  FIG. 1 , the lower-left corner  16   c  of the image display apparatus  10 B, the upper-right corner  16   b  of the image display apparatus  10 C, and the upper-left corner  16   d  of the image display apparatus  10 D are the vicinal corners  18 . In this embodiment, the area (area of dotted circle) having the vicinal corners  18  is the communicable area O. 
     The tag  14  is a sender capable of sending data within an area including the vicinal corners  18  via near field communication. Moreover, the reader  15  is a receiver capable of receiving data from the tags  14  of other image display apparatuses  10 , the tags  14  being arranged on the vicinal corners  18 , within the area including the vicinal corners  18  via near field communication. With this configuration, each tag  14  sends data on each vicinal corner  18  to the reader  15 , whereby it is possible to determine the positional relation of the vicinal corners  18 . 
     As described above, according to the present technology, a sender and a receiver are capable of communicating with each other via near field communication within the communicable area O, i.e., an area including the vicinal corners  18 . Moreover, communication directionality of a plurality of senders and receivers is low, and they are capable of communicating with each other wirelessly within the communicable area O. Typically for example the RFID tags  14  and the RFID readers  15  may be used as such senders and receivers. 
     The size of the communicable area O is not specifically limited. The size of the communicable area O may be arbitrarily set as long as near field communication is performed within an area including the vicinal corners  18 . In other words, the communicable area of the tags  14  and the readers  15  may be arbitrarily set as long as wireless communication is enabled within a predetermined distance or less. 
     Typically each of the tags  14  and the readers  15  has a communicable distance of about several mm to several tens of cm. The communicable distance may be set depending on gaps between the two-dimensionally arranged image display apparatuses  10 , the width of the frames  12 , and the like. For example if the communicable distance is equal to or shorter than the short side  17   a  out of the four sides of  FIG. 1 , near field communication is established within an area including the vicinal corners  18 . In other words, the communicable area O may be set based on the size of the image display apparatus  10  or the like. 
     The configuration of the tag  14  and the configuration of the reader  15  are not specifically limited. In this embodiment, passive tags are used. A passive tag uses radio waves from the reader  15  as an energy source and thus operate. With this configuration, the configuration of the system may be simplified. Alternatively, active tags or semi-active tags (having properties of both tags) may be used. Moreover, a communication method is not limited, and an arbitrary communication method such as a radio wave method or an electromagnetic induction method may be used. 
     As shown in  FIG. 1 , in this embodiment, the tags  14  and the readers  15  are arranged on all the four corners  16 , respectively. Each tag  14  is capable of wirelessly sending information on the ID of the image display apparatus  10  and the position (lower-right, upper-right, lower-left, or upper-left) of the tag  14 . For example, the tag  14 , which is arranged on the lower-left corner  16   c  of the image display apparatus  10 B of  FIG. 1 , sends information on the ID of the image display apparatus  10 B and on the lower-left position. The readers  15  on the vicinal corners  18  receive the tag information. 
       FIG. 2  is a functional block diagram showing the image display apparatus  10 , which is configured to send and receive tag information. The image display apparatus  10  includes the tag  14 , the reader  15 , a reader controller  19 , a communication controller  20 , and a communication unit  21 . A CPU  22  executes predetermined programs to thereby realize the reader controller  19  and the communication controller  20 . The communication unit  21  is a communication apparatus configured to communicate with the integration control apparatus  50 . For example the communication unit  21  includes a modem capable of connecting to a LAN, a WAN, and the like, a router, and the like. The communication unit  21  may be independent of the image display apparatus  10 . 
     A wireless receiver  23  of the reader  15  receives communication from the tags  14  of the other image display apparatuses  10  arranged on the vicinal corners  18 . Moreover, the reader  15  obtains tag information on the tags  14 . The reader controller  19  outputs the tag information obtained by the reader  15  to the communication controller  20 . The communication controller  20  sends the tag information to the integration control apparatus  50  via the communication unit  21 . The integration control apparatus  50  manages all the plurality of image display apparatuses  10 . As described above, each image display apparatus  10  sends tag information obtained by each reader  15  to the integration control apparatus  50  via each communication unit  21 . 
     The integration control apparatus  50  combines pieces of tag information obtained from all the image display apparatuses  10 , to thereby calculate the overall shape of the plurality of two-dimensionally arranged image display apparatuses  10  and the positions of the image display apparatuses  10 . To display an image on the display screens  11  of the image display apparatuses  10 , the integration control apparatus  50  sends drawing instructions to the image display apparatuses  10  based on the positions and directions of the image display apparatuses  10 . 
     The integration control apparatus  50  is any kind of computer such as for example a PC (Personal Computer).  FIG. 3  is a block diagram schematically showing a configuration example of hardware of the integration control apparatus  50 . The integration control apparatus  50  functions as a control apparatus capable of controlling at least part of operations of a plurality of unit apparatuses of the image display system  100  of this embodiment. Moreover, the integration control apparatus  50  also functions as an information processing apparatus of the present technology. Each image display apparatus  10  may function as an information processing apparatus of the present technology, and may have a configuration approximately similar to the hardware configuration of  FIG. 3 . 
     The integration control apparatus  50  includes a CPU  51 , a ROM  52 , a RAM  53 , an input/output interface  55 , and a bus  54  connecting them. A display unit  56 , an input unit  57 , a storage unit  58 , a communication unit  59 , a driver unit  60 , and the like connect to the input/output interface  55 . 
     The display unit  56  is for example a liquid crystal display device, an EL (Electro-Luminescence) display device, a CRT (Cathode Ray Tube) display device, or the like. The input unit  57  is an operating device such as for example a controller, a pointing device, a keyboard, or a touchpad. If the input unit  57  includes a touchpad, the touchpad and the display unit  56  may be integrally structured. 
     The storage unit  58  is a nonvolatile storage device such as for example an HDD (Hard Disk Drive), a flash memory, or another solid-state memory. The driver unit  60  is a device capable of driving a removable storage medium  61  such as for example an optical storage medium, a floppy (registered trademark) disk, a magnetic storage tape, or a flash memory. Meanwhile, in most cases, the storage unit  58  is a device built in the integration control apparatus  50 , and mainly drives a non-removable storage medium. 
     The communication unit  59  is a communication device configured to communicate with other devices. The communication unit  59  is a modem capable of connecting to a LAN, a WAN, or the like, a router, or the like. The communication unit  59  may perform wired and wireless communication. In most cases, the communication unit  59  is independent of the integration control apparatus  50 . In this embodiment, the communication unit  59  functions as a data receiver. The readers  15  of the plurality of image display apparatuses  10  receive tag information (data) from the tag  14  via wireless communication. The data receiver receives the tag information (data). 
     The integration control apparatus  50  has the above-mentioned hardware configuration. Software stored in the storage unit  58 , the ROM  52 , or the like and the hardware resources of the integration control apparatus  50  cooperate, whereby the integration control apparatus  50  processes information. Specifically, a program configuring software is stored in the storage unit  58 , the ROM  52 , or the like. The CPU  51  loads the program in the RAM  53 , and executers the program, whereby information is processed. 
     For example the program is stored in a storage medium, and is installed in the integration control apparatus  50 . Alternatively, the program is installed in the integration control apparatus  50  via a global network or the like. Moreover, a program may cause the integration control apparatus  50  to process information in order in time series. Alternatively, a program may cause the integration control apparatus  50  to process information in parallel as necessary (e.g., when program is called). 
       FIG. 4  is a block diagram schematically showing a functional configuration example of the integration control apparatus  50 . The CPU  51  of  FIG. 3  executes a predetermined program, whereby software blocks (i.e., vicinal adjacent portion determining unit  62 , arrangement status calculator  63 , and arrangement error detector  64 ) are realized. 
     The vicinal adjacent portion determining unit (hereinafter simply referred to as determining unit  62 ) determines the positional relation of adjacent portions based on pieces of tag information received from the readers  15 . In other words, the determining unit  62  is capable of determining an image display apparatus  10  having a vicinal corner  18  on which a tag  14  is arranged, which is in the vicinity of the corners  16  on which the readers  15  are arranged. Moreover, the determining unit  62  is capable of determining the position of the vicinal adjacent portion  18  on which the tag  14  is arranged out of the corners  16  of the determined image display apparatus  10 . 
     With reference to the lower-right corner  16   a  of the image display apparatus  10 A of  FIG. 1 , processing executed by the determining unit  62  will be described. The reader  15  is arranged on the corner  16   a  of the image display apparatus  10 A, and receives pieces of tag information. The determining unit  62  obtains the pieces of tag information. Based on the pieces of tag information, the determining unit  62  determines the image display apparatuses  10 B to  10 D each having the vicinal corner  18  in the vicinity of the corner  16   a . Moreover, the determining unit  62  determines the positions of the corners  16  of the image display apparatuses  10 B to  10 D that the vicinal corners  18  correspond to. In other words, the determining unit  62  determines that the vicinal adjacent portions  18  are the lower-left corner  16   c  of the image display apparatus  10 B, the upper-right corner  16   b  of the image display apparatuses  10 C, and the upper-left corner  16   d  of the image display apparatus  10 D. 
     The arrangement status calculator  63  (hereinafter simply referred to as calculator  63 ) is capable of calculating the arrangement status of the plurality of image display apparatuses  10  based on the pieces of tag information received from the readers  15 . Specifically, the calculator  63  is capable of calculating the arrangement status of the plurality of image display apparatuses  10  based on the result (image display apparatuses  10  including vicinal adjacent portions  18 ) and the result (positions of vicinal adjacent portions  18 ) determined by the determining unit  62 . 
     The arrangement error detector  64  (hereinafter simply referred to as detector  64 ) is capable of detecting an upside-down image display apparatus  10  out of the plurality of image display apparatuses  10  based on the results determined by the determining unit  62 . The display unit  25  of the image display apparatus  10  of this embodiment has its top and bottom in use. When the image display apparatuses  10  are arranged two-dimensionally, the tops of the display units  25  of the image display apparatuses  10  come to the upper side, and the bottoms come to the lower side. For example in the example of  FIG. 1 , the plurality of image display apparatuses  10  are arranged in which the y direction is the vertical direction and the direction from bottom to top is the positive direction along the y axis. At this time, the detector  64  detects an upside-down image display apparatus  10 . 
     [Operation of Image Display System] 
     As an operation of the image display system  100  of this embodiment, process of calculating an arrangement status by the integration control apparatus  50  will mainly be described.  FIGS. 5A and 5B  are diagrams illustrating the process. As shown in the example of  FIGS. 5A and 5B , the four image display apparatuses  10 A to  10 D having IDs (A, B, C, and D), respectively, are arranged. 
     Each of the four corners  16  of each image display apparatus  10  has the tag  14  and the reader  15 . Each tag  14  sends tag information. The tag information is information on the ID of the image display apparatus  10 , and the position (lower-right, upper-right, lower-left, or upper-left) of the tag  14 . Hereinafter the tag information will be referred to as the combination of (ID, tag position). For example the tag  14  of the lower-right corner  16   a  of the image display apparatus  10 A sends tag information (A, lower-right). The tag  14  of the upper-left corner  16   d  of the image display apparatus  10 D sends tag information (D, upper-left). 
     The integration control apparatus  50  refers to pieces of tag information obtained by a reader  15  of a predetermined corner of a predetermined image display apparatus out of the four image display apparatuses  10 . In the example of  FIGS. 5A and 5B , the integration control apparatus  50  refers to pieces of tag information obtained by the reader  15  of the lower-right corner  16   a  of the image display apparatus  10 A. The reader  15  receives tag information (B, lower-left), tag information (C, upper-right), and tag information (D, upper-left). The determining unit  62  determines the positional relation of the corners  16  based on those pieces of tag information. The calculator  63  calculates the arrangement status based on those pieces of tag information as follows. 
     Tag information (B, lower-left): the image display apparatus  10 B is arranged at the right of the image display apparatus  10 A. 
     Tag information (C, upper-right): the image display apparatus  10 C is arranged at the bottom of the image display apparatus  10 A. 
     Tag information (D, upper-left): the image display apparatus  10 D is arranged at the lower-right of the image display apparatus  10 A. 
     The arrangement status is two-by-two (arrangement status of  FIG. 5B ), and the overall shape is rectangular. 
     An arbitrary image display apparatus may be selected as the predetermined image display apparatus. The image display apparatus may be previously selected. Alternatively, for example the image display apparatus  10  connecting to the integration control apparatus  50  at first when the image display apparatuses  10  are arranged two-dimensionally may be selected as the predetermined image display apparatus. Moreover, the predetermined corner  16 , whose pieces of tag information will be referred to, may not be the lower-right corner  16   a . A corner  16  at an arbitrary position may be selected. 
     If the reader  15  of a predetermined corner does not obtain tag information (for example reader  15  of upper-left corner  16   d  of image display apparatus  10 A, etc.) or if the arrangement status is not defined based on the obtained tag information (for example reader  15  of lower-left corner  16   c  of image display apparatus  10 A, etc.), the integration control apparatus  50  refers to tag information obtained by the reader  15  of another corner  16 . In this case, a method of selecting another corner  16  may be determined. For example, a method of selecting the adjacent corner  16  clockwise may be employed arbitrarily. 
     Note that the determining unit  62  may determine the overall positional relation of the corners  16  based on the pieces of tag information obtained from all the reader  15 . The calculator  63  may calculate the arrangement status based on some pieces of information on the determination result. Meanwhile, the determining unit  62  may determine the overall positional relation, and the calculator  63  may calculate the arrangement status before referring to tag information. A single block may be configured to function as the determining unit  62  and the calculator  63  of  FIG. 4 . 
       FIGS. 6A and 6B  are diagrams each schematically showing an arrangement example in which the overall shape is not rectangular. In  FIG. 6A , the image display apparatus  10 E, whose ID is E, is arranged at the right of the image display apparatus  10 B. Even with this arrangement, the calculator  63  may calculate the arrangement status of the plurality of image display apparatuses  10  based on pieces of tag information received by for example the lower-right reader  15  and the upper-right reader  15  of the image display apparatus  10 B. As a matter of course, the calculator  63  may calculate the arrangement status based on pieces of tag information received by the lower-left reader  15  and the upper-left reader  15  of the image display apparatus  10 E. 
     In  FIG. 6B , the image display apparatus  10 E is arranged at the upper-right of the image display apparatus  10 B.  FIG. 6B  shows an arrangement example in which only a vertex of the image display apparatus  10 E is adjacent to a vertex of another image display apparatus, and sides of the image display apparatus  10 E are not adjacent to sides of other image display apparatuses. Even in this case, the integration control apparatus  50  refers to a piece of tag information received by the upper-right reader  15  of the image display apparatus  10 B or a piece of tag information received by the lower-left reader  15  of the image display apparatus  10 E, whereby the calculator  63  is capable of calculating the arrangement status. 
     As described above, according to the image display system  100  of this embodiment, each corner  16  of each of the plurality of image display apparatuses  10  includes the tag  14  and the reader  15 , which are capable of communicating with each other via near field communication. With this configuration, the reader  15  is capable of receiving data via near field communication from the tags  14  of the corners  16  of other image display apparatuses  10 . As a result, it is possible to manage the arrangement status of the plurality of image display apparatuses  10  based on data received by the readers  15 . 
     In this embodiment, the tag  14  and the reader  15  are capable of communicating with each other via near field communication in the area including the vicinal corners  18 . The reader  15  receives pieces of tag information from the tags  14  of the vicinal corners  18  in the vicinity of the corner  16  on which the reader  15  is arranged. The reader  15  sends the pieces of received tag information to the integration control apparatus  50 . 
     The integration control apparatus  50  collects pieces of tag information received by the readers  15 , and determines which image display apparatus  10  each vicinal corner  18  belongs to. Moreover, the integration control apparatus  50  determines the position of the corner  16  of an image display apparatus  10  that each vicinal corner  18 , on which a tag  14  is arranged, corresponds to. In this manner, there is realized a useful system capable of calculating and managing the arrangement status of the plurality of image display apparatuses  10 , which are two-dimensionally arranged. 
     In recent years, display apparatuses configured to display images are being upsized. However, it may be difficult to upsize display apparatuses dramatically in the future from the viewpoints of manufacturing costs, demands, installation difficulty, and the like. Meanwhile, the widths of bezels (frames) of display apparatuses are getting smaller. An environment, which facilitates realization of an image display system constructing one large screen display with a plurality of arrayed displays, is being developed. Such an image display system is sometimes referred to as a grid-type display. Each display is sometimes referred to as a grid. 
     If the number of displays is small, it is not very difficult to arrange displays in a predetermined positional relation. In other words, it is relatively easy for an operator to set up each display, a central controller, or the like individually depending on the positional relation of displays after the displays are arranged. However, the larger the number of two-dimensionally arranged displays, the larger the burden imposed on an operator. 
     For example according to the above-mentioned technology described in Japanese Patent Application Laid-open No. 2012-83403, it is supposed that unit monitors are connected with each other by using connector members such as mechanical switches or connectors. In other words, it is necessary to expose such connector members on the side surfaces of the unit monitors. The connector members may thus be worn out, and in addition product design and the like may be likely to be restricted. Moreover, it is necessary for each unit monitor to manage eight signal senders and signal receivers arranged at the top, bottom, right, and left. Moreover, the configurations of the connector members, the signal senders, and the signal receivers are complicated. 
     According to another technology, light-emitting portions and light-receiving portions having directionality are provided on side surfaces of unit monitors, and information on arrangement of unit monitors is determined based on light-receiving timing. However according to this technology, similar to the technology of Japanese Patent Application Laid-open No. 2012-83403, it is necessary to expose light-emitting portions and light-receiving portions on the side surfaces of unit monitors. As a result, light-emitting portions and light-receiving portions may be worn out, and design may be degraded. Moreover, it is necessary to manage eight light-emitting portions and light-receiving portions. The structures of the light-emitting portions and the light-receiving portions may be complicated. 
     To the contrary, according to the image display system  100  of this embodiment, the tag  14  and the reader  15  for near field communication are arranged on each of the four corners  16  of the frame  12  of each image display apparatus  10 . Moreover, pieces of tag information obtained by the readers  15  are collected. As a result, the shape of the entire large screen display is calculated, and the positions of the image display apparatuses  10  are calculated. 
     In RFID contactless near field communication, it is not necessary to connect the image display apparatuses with each other  10  by using connector members such as connectors. Moreover, because the communication directionality is low, it is not necessary to arrange the tags  14  and the readers  15  on the side surfaces of the image display apparatuses  10 . That is, it is not necessary to arrange and expose connector members and communication devices on the side surfaces of the image display apparatuses. As a result, it is possible to prevent problems, which result from the above-mentioned worn-out members, from occurring. Moreover, it is possible to increase the degree of freedom of product design. 
     Moreover, in this embodiment, the tag  14  reacts to the reader  15 , and communication is then established. Because of this, it is not necessary for the sender-side image display apparatus  10  to supply power to its tags  14  and to control the tags  14 . That is, burden imposed on the image display apparatus  10  is reduced. For example, only by managing four readers  15 , the image display system  100  may be operated properly. Moreover, managing costs may be reduced. 
     Moreover, an RFID tag and a reader have relatively simple configurations, and are low in cost. As a result, the configuration of the image display apparatus  10  may not be complicated, and the cost of the image display apparatus  10  may be reduced. 
       FIG. 7  is a diagram showing a state where an image display apparatus  10  is arranged upside down. In the example of  FIG. 7 , the image display apparatus  10 D is arranged upside down. In this case, the reader  15  of the lower-right corner  16   a  of the image display apparatus  10 A receives pieces of tag information (B, lower-left), (C, upper-right), and (D, lower-right). 
     In this embodiment, when the plurality of image display apparatuses  10  are two-dimensionally arranged, the tops come to the upper side, and the bottoms come to the lower side. Because of this, the reader  15  of the lower-right corner  16   a  of the image display apparatus  10 A never receives tag information (D, lower-right) if the plurality of image display apparatuses  10  are arranged correctly. The detector  64  detects an error when such tag information is received. Moreover, the detector  64  detects the image display apparatus  10 D, which is arranged upside down, based on the tag information resulting in an error. 
     The display unit  56  of the integration control apparatus  50  of  FIG. 3  displays an alarm of the detected error, for example. Alternatively, the integration control apparatus  50  may notify an operator of the upside-down error with a sound and the like. As a result, an operator may detect erroneous arrangement, wrong arrangement, and the like promptly. It is possible to prevent proper image display from being prevented. 
     Second Embodiment 
     An image display system according to a second embodiment of the present technology will be described. In the below description, configurations and effects similar to the configurations and effects of the image display system  100  of the above-mentioned embodiment will not be described, or description thereof will be simplified. 
       FIGS. 8A and 8B  are diagrams each schematically showing image display apparatuses  210  of this embodiment. This embodiment is different from the first embodiment in the number of the reader  215  arranged on the image display apparatus  210 . As shown in  FIG. 8A , each of four corners  216  (plurality of adjacent portions) has a tag  214 . In addition, a predetermined first corner of the four corners  216  has the reader  215 . In other words, in this embodiment, the image display apparatus  210  has only one reader  215 . 
     The position of the predetermined first corner out of the four corners  216  is determined. In other words, any one of lower-right, upper-right, lower-left, and upper-left corners  216  is set as a first corner. The set first corner of each image display apparatus  210  has the reader  215 . As shown in  FIGS. 8A and 8B , in this embodiment, the lower-right corner  216   a  is set as the first corner, and has the reader  215 . 
     In this embodiment, the reader  215  of the lower-right corner  216   a  of the image display apparatus  210 A obtains pieces of tag information. The pieces of tag information are referred to. Similar to the above-mentioned embodiment, the arrangement status is calculated as follows based on the pieces of tag information (B, lower-left), (C, upper-right), and (D, upper-left) obtained by the reader  215 . 
     Tag information (B, lower-left): the image display apparatus  210 B is arranged at the right of the image display apparatus  210 A. 
     Tag information (C, upper-right): the image display apparatus  210 C is arranged at the bottom of the image display apparatus  210 A. 
     Tag information (D, upper-left): the image display apparatus  210 D is arranged at the lower-right of the image display apparatus  210 A. 
     The arrangement status is two-by-two (arrangement status of  FIG. 8B ), and the overall shape is rectangular. 
     If the tops of the image display apparatuses  210  come to the upper side and the bottoms come to the lower side as described above, and if the positions of the corners  216  having the readers  215  of the image display apparatuses  210  are the same (if each first corner has a reader), the number of the reader  215  arranged on the image display apparatus  210  may be only one. 
     The reader  215  (reader  215  of image display apparatus  10 D) is capable of detecting no tags  214  arranged on the vicinal adjacent portions at a minimum. The reader  215  (reader  215  of image display apparatus  10 A) is capable of detecting three tags  214  arranged on the vicinal adjacent portions at a maximum. Moreover, the reader  215  is capable of determining the positional relation of the adjacent image display apparatuses  210  based on pieces of tag information on the detected tags  214 . Pieces of tag information obtained by the readers  215  of all the image display apparatuses  210  are collected, whereby it is possible to calculate the shape of the entire large screen display and the positions of the image display apparatuses  210 . Because the number of the readers  215  is reduced, it is possible to reduce costs for components and management costs. 
     Each of  FIGS. 9A and 9B  to  FIG. 11  is a diagram illustrating an arrangement example, in which each image display apparatus  210  includes one reader  215 . The tops of the image display apparatuses  210  come to the upper side, and the bottoms come to the lower side. In this case, for example, a corner  216  other than the lower-right corner  216   a  may be set as a predetermined first corner. As shown in  FIG. 9A , the upper-right corner  216   b  may be set as a first corner, and may have the reader  215 . 
     For example, the reader  215  of the upper-right corner  216   b  of the image display apparatus  210 C obtains pieces of tag information, and the arrangement status may be calculated based on the tag information. Alternatively, another corner  216  may be set as a first corner. 
     As shown in  FIG. 9B , the overall shape of the plurality of two-dimensionally arranged image display apparatuses  210  may not be rectangular. For example if each lower-right corner  216   a  has the reader  215 , and if the tops of the image display apparatuses  210  come to the upper side and the bottoms come to the lower side, an image display apparatus  210  may be arranged so that the image display apparatus  210  may be adjacent to any one of the image display apparatuses  210 A to  210 D of  FIG. 8B . As shown in  FIG. 9B , if the image display apparatus  210 E is arranged at the right of the image display apparatus  210 B, the reader  215  of the image display apparatus  210 B receives tag information from the tag  214  of the image display apparatus  210 E. The arrangement status may be calculated based on the tag information. 
     As shown in  FIGS. 10A and 10B , only vertices may be adjacent to each other, and sides are not adjacent to each other. Note that, in this case, it is necessary to arrange another image display apparatus  210  so that the image display apparatus  210  may be adjacent to the lower-right corner  216   a  on which the reader  215  is arranged. In other words, a reader  215  of any one of the image display apparatuses  210  has to receive information on each image display apparatus  210 . 
     In the example of  FIG. 10A , the image display apparatus  210 E is arranged at the lower-right of the image display apparatus  210 D. In this case, the reader  215  of the image display apparatus  210 D receives tag information from a tag  214  of the image display apparatus  210 E. It is possible to calculate the arrangement status based on the tag information. Meanwhile, in the example of  FIG. 10B , the image display apparatus  210 E is arranged at the upper-right of the image display apparatus  210 B. In this case, the image display apparatus  210 E is adjacent to the corner  216   b  on which no reader  215  is arranged. With this structure, no reader  215  is capable of receiving tag information from the tags  214  of the image display apparatus  210 E. In other words, according to the arrangement of  FIG. 10B , it is not possible to calculate the arrangement status. 
     Moreover, the arrangement shown in  FIG. 11  is different from the arrangement in which vertices are adjacent to each other. In this case, the arrangement status may not be calculated accurately. For example as shown in  FIG. 11 , the image display apparatus  210 E is arranged at the right of the image display apparatuses  210 B and  210 D, and the boundary of the two image display apparatuses  210 B and  210 D is approximately at the center of one side of the image display apparatus  210 E. In this case, neither the reader  215  of the image display apparatus  210 B nor the reader  215  of the image display apparatus  210 D receives tag information from the tags  214  of the image display apparatus  210 E. Alternatively, the reader  215  of the image display apparatus  210 B or the reader  215  of the image display apparatus  210 D receives tag information on the image display apparatus  210 E. In this case, also, it is only calculated that the image display apparatus  210 E is arranged at the right of the image display apparatus  210 B or  210 D. The arrangement status is not calculated accurately. 
     In view of the examples of  FIG. 10B  and  FIG. 11  and the like (i.e., in view of various conditions such as overall shape, arrangement, and direction, and other conditions), the number of the readers  215  arranged on the image display apparatus  210 , the positions of the corners  216  on which the readers  215  are arranged, and the like may be set arbitrarily. Note that, in the example of  FIG. 10B , tag information on the image display apparatus  210  (image display apparatus  210 E of  FIG. 10B ) is not obtained out of the image display apparatuses  210  connecting to the integration control apparatus  50 . In this case, for example an alarm may be displayed to inform of an error. 
       FIGS. 12A and 12B  are diagrams showing a state where an image display apparatus  210  is arranged upside down. For example as shown in  FIG. 12A , the image display apparatus  210 B is below the image display apparatus  210 A and is arranged upside down. Here, it is supposed that the tops of the image display apparatuses  210  come to the upper side, and the bottoms come to the lower side. Moreover, the reader  215  is arranged on the lower-right corner  216   a , i.e., the first corner. 
     The reader  215  of the lower-right corner  216   a  of the image display apparatus  210 A receives tag information (B, lower-left). It is calculated based on the information that the image display apparatus  210 B is arranged at the right of the image display apparatus  210 A as shown in  FIG. 12B . In other words, it is calculated that the image display apparatus  210 B is not arranged at the bottom and at the lower-right of the image display apparatus  210 A. Meanwhile, the reader  215  of the lower-right corner  216  of the image display apparatus  210 B receives tag information (A, lower-left). Based on the information, it is calculated that the image display apparatus  210 A is arranged at the right of the image display apparatus  210 B, and that the image display apparatus  210 A is not arranged at the bottom and at the lower-right of the image display apparatus  210 B. 
     In other words, there occurs conflict between an arrangement status based on one piece of tag information and an arrangement status based on the other piece of tag information. The detector  64  of the integration control apparatus  50  detects that such conflict (i.e., error) occurs. Then, the image display apparatus  210 B arranged upside down is detected based on the tag information resulting in an error. An operator is notified of the detected error with alarm display, sounds, or the like. As a result, an operator is capable of detecting arrangement errors, wrong arrangement, and the like promptly. Note that an operator may be notified of an error, i.e., the upside-down image display apparatus  210 A or  210 B. 
     Third Embodiment 
     An image display system according to a third embodiment of the present technology will be described.  FIG. 13  is a diagram schematically showing an arrangement status according to an example of this embodiment. The display unit of an image display apparatus  310  of this embodiment is a rectangle having a long-side direction and a short-side direction. Moreover, the display unit of the image display apparatus  310  is capable of being used right side up and upside down, the short-side direction being a vertical direction. In other words, the display unit of the image display apparatus  310  is capable of displaying an image properly even if it is upside down. 
     The vertical direction of the image display apparatus  310  has a normal-use orientation and an orientation opposite to the normal-use orientation. As a matter of convenience, the normal-use orientation will be referred to as “correct orientation”, and the orientation opposite to the normal-use orientation will be referred to as “inverse orientation”. In the example of  FIG. 13 , the image display apparatus  310 B (correct orientation) is arranged at the left of the image display apparatus  310 A (correct orientation). The image display apparatus  310 C (inverse orientation) is arranged at the top of the image display apparatus  310 A. The image display apparatus  310 D (inverse orientation) is arranged at the top of the image display apparatus  310 B, i.e., at the left of the image display apparatus  310 C. 
     Tags  314  are arranged on four corners  316  of each image display apparatus  310 . Readers  315  are arranged on a predetermined first corner and a second corner out of the four corners  316 . The second corner is diagonal from the first corner. In other words, each image display apparatus  310  includes the four tags  314  and the two readers  315 . As shown in  FIG. 13 , in this embodiment, the lower-right corner  316   a  is set as the first corner, and the upper-left corner  316   d  is set as the second corner. The readers  315  are arranged on the first and second corners, respectively. 
     In this embodiment, also, each reader  315  of each image display apparatus  310  obtains pieces of tag information. The pieces of tag information are combined. As a result, the arrangement status of the plurality of image display apparatuses  310  may be calculated. 
     Each of  FIG. 14  and  FIG. 15  is a flowchart showing the flow of calculation of an arrangement status according to this embodiment. Hereinafter, the image display apparatus  310  will be referred to as a grid  310 . 
     In this embodiment, the following pieces of information are stored corresponding to the plurality of arranged grids  310 . 
     (info[0]. x, y, direction) 
     (info[1]. x, y, direction) 
     (info[2]. x, y, direction)
         •   •   •       

     (info[n(n=grids−1)]. x, y, direction) 
     One piece of (info[ ]. x, y, direction) is stored for one grid  310 . 
     The number in (info[ ]) is assigned to each grid  310 . In this embodiment, the number 0 is assigned to the reference grid  310 . The numbers 1 to n are assigned to the other grids  310 . Any method of assigning numbers may be employed. For example the grid  310 , which connects to the integration control apparatus  50  first, is selected as the grid  310  having the number 0. After that, sequence numbers are assigned in the order of connection. Such a method may be used. Another arbitrary method may be used. 
     Hereinafter, a grid to which a number is assigned will be referred to as “grid(number)”. For example, the grid  310  to which the number 0 is assigned is “grid0”. 
     (info[ ]. x, y) means a relative position from the grid  310  having the number 0. In this embodiment, as shown in  FIG. 13 , a coordinate system is set to show the positions of the two-dimensionally arranged grids  310 . The coordinate of the grid0, i.e., the origin, is (0, 0). 
     If a grid is adjacent to the grid0 in the positive direction of a coordinate axis, the coordinate value is larger than that of the grid0 by one. If a grid is adjacent to the grid0 in the negative direction of a coordinate axis, the coordinate value is smaller than that of the grid0 by one. In other words, grid0 has (info[0]. 0, 0). The grid  310  at the right of the grid0 has (info[ ]. 1, 0). Moreover, the grid at the lower-left of the grid0 is (info[ ]. −1, 1). 
     (info[ ].direction) shows the vertical orientation of each grid  310 . In other words, (info[ ].direction) is information concerning if the grid  310  is arranged in the correct orientation or in the inverse orientation. In this case, also, the grid  310  having number 0 is the reference. If the orientation of a grid  310  is same as the orientation of the grid0, the grid  310  has (info[ ].true). Meanwhile, if the orientation of a grid  310  is opposite to the orientation of the grid0, the grid  310  has (info[ ].false). 
     The vertical orientation of the grid  310  is used to display an image properly. Meanwhile, the orientation of the entire two-dimensionally arranged grids  310  is different depending on a use situation. For example as shown in  FIG. 16A , in some cases, when the plurality of grids  310  are used, the positional relation of the plurality of grids  310  is the same as the positional relation of  FIG. 13 , and the entire grids  310  are rotated by 180 degrees. Moreover, as shown in  FIG. 16B , in some cases, when the plurality of grids  310  are used, the positional relation of the plurality of grids  310  is the same as the above, and the entire grids  310  are rotated by 90 degrees. In this manner, in some cases, the orientation of the entire grids  310  is set arbitrarily, and the grids  310  are used. 
     In the example of  FIG. 16A , when the grids  310  are arranged, the entire grids  310  are downward-facing, and the downward-facing orientation is the correct orientation. In the example of  FIG. 16B , when the grids  310  are arranged, the entire grids  310  are laterally-facing, and the laterally-facing orientation is the correct orientation. The above-mentioned (info[ ].direction) is information concerning the orientation of each grid  310  out of the plurality of grids  310 , irrespective of the orientation of the entire grids  310 . 
     With this configuration, according to calculation of an arrangement status of this embodiment, the positional relation of each grid  310  may be determined uniquely, but the entire orientation may not be determined. To deal with this matter, a sensor configured to detect an orientation may be used, or an operator may confirm with his eyes and set the orientation. The latter method to deal with this matter troubles the operator. However, all he needs is to set up the entire system only once. So a burden imposed on him is lower enough than a burden when setting positions of grids, which leads to a problem. 
     (info[ ]. x, y, direction) of all the grids  310  are calculated, and the arrangement status is thus calculated. Hereinafter, description will be made in more detail. 
     With reference to the flowchart of  FIG. 14 , first, (info[ ]. x, y, direction) corresponding to each grid  310  is initialized (Step  101 ). 
     grid1 to gridn other than grid0 (origin) are set for grid_list (Step  102 ). grid_list is a list in which the grids  310 , whose positions and orientations are unknown, are set. If no grid  310  is set for grid_list, the arrangement status is calculated. 
     Information on grid0 is set for (info[ ]. 0, 0, true) (Step  103 ). A subroutine check_grid(cur) is read out, and the subroutine check_grid(0) is executed in which grid0 is the origin (Step  104 ). 
       FIG. 15  is a flowchart showing the flow of check_grid(cur). As shown in Steps  201   a  and  201   b , loop processing is executed for upper, lower, left, right, upper-left, and lower-right positions. The upper, lower, left, right, upper-left, and lower-right positions are adjacent positions in the respective directions. In other words, a grid  310 , which is adjacent to the passed grid(gridcur), is inspected in order. Here, the grid  310  adjacent to grid0 is inspected. 
     It is determined if there is a new grid  310  (gridnew) in the pos direction (above-mentioned position direction) of gridcur or not. In addition, it is determined if grid_list includes gridnew or not (Step  202 ). Here, first, it is determined if there is a grid  310  adjacent to the upper side of grid0 or not. In addition, it is determined if grid_list includes the grid  310  or not. Note that if there is gridnew in the pos direction or not is determined based on pieces of tag information collected by the integration control apparatus  50 . 
     If there is no gridnew or if inspection is completed and grid_list includes no gridnew (Step  202 , No), the next position is inspected (Step  201   b ). 
     If there is gridnew (Step  202 , Yes), the position of gridnew is set up based on the position of gridcur and the position of gridnew. In other words, after Step  203 , (info[new]. x, y) is set up as follows based on the coordinate system of  FIG. 13 . 
     If pos=upper (Step  204 ), 
     info[new].x=info[cur].x 
     info[new].y=info[cur].y−1 
     If pos=lower (Step  205 ), 
     info[new].x=info[cur].x 
     info[new].y=info[cur].y+1 
     If pos=left (Step  206 ), 
     info[new].x=info[cur].x−1 
     info[new].y=info[cur].y 
     If pos=right (Step  207 ), 
     info[new].x=info[cur].x+1 
     info[new].y=info[cur].y 
     If pos=lower-left (Step  208 ), 
     info[new].x=info[cur].x−1 
     info[new].y=info[cur].y−1 
     If pos=lower-right (Step  209 ), 
     info[new].x=info[cur].x+1 
     info[new].y=info[cur].y+1 
     For example let&#39;s assume that there is grid1 (gridnew) at the upper side of grid0. Then the position information on grid1 is (info[1]. 0, −1). For example if there is grid1 at the lower-right side of grid0, the position information is (info[1]. 1, 1). In this manner, position information on an adjacent grid is calculated. 
     With reference to the orientation of grid0, the orientation of gridnew is determined, and true or false is set for (info[new].direction) (Step  210 ). Since the position and the orientation of gridnew are clarified, gridnew is removed from grid_list (Step  211 ). 
     The subroutine check_grid(cur) is recursively read out, and the subroutine check_grid (new_grid) is executed, in which a gridnew is the origin (Step  212 ). In other words, the gridnew is inspected. If the recursively read-out subroutine check_grid(new_grid) is completed, then it is inspected if there is a grid or not at the next position. If the grids at all the positions are inspected, and if all (info[ ]. x, y, direction) are calculated, the arrangement status is calculated. 
     Here, an example of a method of determining an adjacent grid and the orientation of the adjacent grid based on pieces of tag information collected by the integration control apparatus  50  will be described.  FIGS. 17A and 17B  and  FIGS. 18A and 18B  are diagrams schematically illustrating the method. 
     Method of confirming grid (pos=upper-left). In the arrangement of  FIG. 17A , the upper-left reader  315  of the grid  310 A reads tag information from the lower-right tag  314  of the grid  310 D. Alternatively, in the arrangement of  FIG. 17B , the upper-left reader  315  of the grid  310 A reads tag information from the upper-left tag  314  of the grid  310 D. In the arrangements of  FIGS. 17A and 17B , there is no grid  310  at the upper or left side of the grid  310 A. However, even if there are, the upper-left reader  315  of the grid  310 A reads no tag information on the lower-right or upper-left tag  314  of the grid  310  at the upper or left side of the grid  310 A, from the viewpoint of the positional relation. 
     Because of this, once the upper-left or lower-right tags  314  are read, it is determined that there is a grid at the upper-left of the grid  310 A. At this time, as shown in  FIG. 17A , if the lower-right tag  314  of the grid  310 D is read, then the orientation of the grid  310 D is the correct orientation (direction=true). As shown in  FIG. 17B , if the upper-left tags  314  of the grid  310 D is read, the orientation of the grid  310 D is the inverse orientation (direction=false). The grid (pos=lower-right) may be confirmed similarly. 
     Method of confirming grid (pos=left). In the arrangement of  FIG. 18A , the upper-left reader  315  of the grid  310 A reads tag information from the upper-right tag  314  of the grid  310 B. Meanwhile, also in the arrangement of  FIG. 18B , the upper-left reader  315  of the grid  310 A reads tag information from the upper-right tag  314  of the grid  310 B. Because of this, the position (left or upper side of grid  310 A) of the grid  310 B may not be determined only by reading the upper-right tag  314  of the grid  310 B. 
     At this time, if a reader  315  of the grid  310 B reads the lower-left tag  314  of the grid  310 A, it is determined that the arrangement of  FIG. 18A  is established. Moreover, it may be determined that the orientation of the grid  310 B is the correct orientation (direction=true). If a reader  315  of the grid  310 B reads the upper-right tag  314  of the grid  310 A, it is determined that the arrangement of  FIG. 18B  is established. In this case, the orientation of the grid  310 B is the inverse orientation (direction=false). The grids (pos=upper, right, left) may be confirmed similarly. 
     As described above, according to this embodiment, even if the orientation of the image display apparatuses  310  is not strictly limited, it is possible to calculate an arrangement status of the plurality of image display apparatuses  310  by combining pieces of tag information from the tags  314 . 
     Fourth Embodiment 
       FIG. 19  is a diagram schematically showing an arrangement status according to an example of a fourth embodiment of the present technology. In this embodiment, each image display apparatus  410  has a square display unit with equal sides, and the image display apparatuses  410  are arranged two-dimensionally. Moreover, the image display apparatuses  410  may be used in the both vertical orientations and in the both horizontal orientations. In other words, the display unit is capable of displaying an image properly even upside down. The display unit is capable of displaying an image properly even if the display unit is rotated by 90 degrees. In other words, the display unit is capable of displaying an image properly irrespective of a side at the bottom out of the four sides. 
     As shown in  FIG. 19 , the tags  414  are arranged on the four corners  416  of each image display apparatus  410 , respectively. The readers  415  are arranged on predetermined three corners out of the four corners  416 . In other words, each image display apparatus  410  has the four tags  414  and the three readers  415 . In the above-mentioned third embodiment, two readers are arranged. However, in this embodiment, it is necessary to determine not only vertical orientation but also horizontal orientation. So the three readers  415  are arranged. The tags  414  and the readers  415  are used, and for example the calculation process described in the third embodiment is used, whereby it is possible to calculate the arrangement status of  FIG. 19 . 
     Note that in the present disclosure, “a rectangle” (or “rectangular”) means a tetragon having the four equal angles, and conceptually includes a rectangle having long sides and short sides and a square having equal sides. 
     Fifth Embodiment 
       FIG. 20  is a diagram schematically showing an arrangement status according to an example of a fifth embodiment of the present technology. Similar to the fourth embodiment, each image display apparatus  510  of this embodiment is a square and may be used in the both vertical orientations and in the both horizontal orientations. 
     Moreover, the image display apparatus  510  of this embodiment includes a sensor (detector) (not shown) capable of detecting the arrangement direction when the image display apparatuses  510  are arranged two-dimensionally. As the sensor, for example an angular velocity sensor such as a gyro sensor, an acceleration sensor, or the like is used. Alternatively, an arbitrary sensor capable of detecting orientation may be used. 
     As shown in  FIG. 20 , the tags  514  are arranged on the four corners  516  of each image display apparatus  510 . The reader  515  is arranged on a predetermined first corner out of the four corners  516 . In this embodiment, the lower-right corner  516   a  is set as the first corner, and the reader  515  is arranged on the lower-right corner  516   a . Moreover, the sensor detects which orientation (upper, lower, left, or right) the vertical correct orientation (arrow N) is oriented. 
     Pieces of tag information obtained by each reader  515  are sent to the integration control apparatus. Moreover, orientation information on each image display apparatus detected by its sensor is sent. Those pieces of information are combined, whereby the arrangement status of  FIG. 20  (overall shape is rectangular) is calculated. 
     For example the lower-right reader  515  of the image display apparatus  510 A receives pieces of tag information (B, lower-right), (C, lower-right), and (D, upper-right). The pieces of tag information (B, lower-right), (C, lower-right), and (D, upper-right) are sent to the integration control apparatus. Moreover, orientation information is referred to as (ID, orientation). Each sensor sends information on (A, upper orientation), (B, right orientation), (C, left orientation), or (D, left orientation) to the integration control apparatus. 
     The integration control apparatus recognizes that the lower-right corner  516   a  of the image display apparatus  510 A is at the lower-right position in fact. Moreover, the integration control apparatus recognizes that the lower-right corner  516   b  of the image display apparatus  510 B (right orientation) is at the lower-left position in fact. In view of this, it is determined that the lower-right reader  515  of the image display apparatus  510 A reads the lower-right tag  514  of the image display apparatus  510 B. As a result, it is calculated that the image display apparatus  510 B (left orientation) is adjacent to the right of the image display apparatus  510 A (upper orientation). The arrangement statuses of the image display apparatuses  510 C and  510 D may be calculated in the same manner. 
     As described above, in this embodiment, each image display apparatus  510  includes a sensor capable of detecting the arrangement direction. With this configuration, even if the number of the readers is smaller, it is possible to calculate the arrangement status irrespective of upper, lower, left, or right orientation. Moreover, it is possible to easily determine the orientation of the plurality of arranged image display apparatuses  510  as a whole. As a matter of course, in the other embodiments, a sensor capable of detecting the arrangement direction may be employed. For example, the image display apparatus  310  of the third embodiment includes a sensor. With this configuration, it is possible to distinguish and calculate the arrangement statuses having different orientations as a whole as shown in  FIGS. 16A and 16B  and the like. As a result, it is possible to reduce a burden imposed on an operator. 
     Sixth Embodiment 
     Each of  FIGS. 21A ,  21 B, and  21 C is a diagram schematically showing an arrangement status according to an example of a sixth embodiment of the present technology. This embodiment is different from the above-mentioned embodiments in the number of tags arranged on each image display apparatus. As shown in  FIGS. 21A ,  21 B, and  21 C, each image display apparatus  610  is rectangular, and has its top and bottom in use. In other words, if the image display apparatuses  610  are arranged two-dimensionally, the tops of the image display apparatuses  610  come to the upper side, and the bottoms come to the lower side. 
     The reader  615  is arranged on the lower-right corner  616   a , which is set as a predetermined first corner, out of the four corners  616 . The tags  614   s  are arranged on two corners  616  out of the three corners  616  except the lower-right corner  616 , i.e., the first corner, out of the four corners. In other words, the tags  614  are arranged on two of the three corners, i.e., the upper-right, lower-left, and upper-left corners  616   b  to  616   d . As shown in  FIG. 21A , the tags  614  may be arranged on the upper-right and lower-left corners  616   b  and  616   c . Alternatively, as shown in  FIG. 21B , the tags  614  may be arranged on the lower-left and upper-left corners  616   c  and  616   d . Alternatively, as shown in  FIG. 21C , the tags  614  may be arranged on the upper-right and upper-left corners  616   b  and  616   d.    
     For example, in the example of  FIG. 21A , the lower-right reader  615  of the image display apparatus  610 A obtains pieces of tag information (B, lower-left) and (C, upper-right). It is possible to calculate based on those pieces of tag information that the image display apparatus  610 B is at the right of the image display apparatus  610 A, and that the image display apparatus  610 C is at the bottom of the image display apparatus  610 A. Moreover, the lower-right reader  615  of the image display apparatus  610 B obtains a piece of tag information (D, upper-right). It is possible to calculate that the image display apparatus  610 D is at the bottom of the image display apparatus  610 B based on the tag information. As a result, it is possible to calculate the arrangement status of  FIG. 21A . 
     In the example of  FIG. 21B , the lower-right reader  615  of the image display apparatus  610 A obtains pieces of tag information (B, lower-left) and (D, upper-left). It is possible to calculate based on those pieces of tag information that the image display apparatus  610 B is at the right of the image display apparatus  610 A, and that the image display apparatus  610 D is at the lower-right of the image display apparatus  610 A. Moreover, the lower-right reader  615  of the image display apparatus  610 C obtains a piece of tag information (D, lower-left). It is possible to calculate based on the tag information that the image display apparatus  610 D is at the right of the image display apparatus  610 C, i.e., that the image display apparatus  610 C is at the left of the image display apparatus  610 D. As a result, it is possible to calculate the arrangement status of  FIG. 21B . 
     In the example of  FIG. 21C , the lower-right reader  615  of the image display apparatus  610 A obtains pieces of tag information (C, upper-right) and (D, upper-left). It is possible to calculate based on those pieces of tag information that the image display apparatus  610 C is at the bottom of the image display apparatus  610 A, and that the image display apparatus  610 D is at the lower-right of the image display apparatus  610 A. Moreover, the lower-right reader  615  of the image display apparatus  610 B obtains a piece of tag information (D, upper-right). It is possible to calculate based on the tag information that the image display apparatus  610 D is at the bottom of the image display apparatus  610 B, i.e., the image display apparatus  610 B is at the top of the image display apparatus  610 D. As a result, it is possible to calculate the arrangement status of  FIG. 21C . 
     As described above, even if each image display apparatus  610  includes only two tags  614 , it is possible to calculate the overall shape of the plurality of two-dimensionally arranged image display apparatuses  610  and the positions of the image display apparatuses  610 . In view of various conditions such as overall shape, arrangement, and direction, and other conditions, the number of the readers  615  arranged on the image display apparatus  610  may be set arbitrarily. 
     Other Embodiments 
     The present technology is not limited to the above-mentioned embodiments, and other various embodiments may be realized. 
     As senders and receivers arranged on image display apparatuses, devices or mechanisms different from RFID tags and RFID readers may be provided. Any arbitrary device or mechanism may be used as long as it is possible to establish communication only within a predetermined distance. A communication medium is not limited to a radio wave or the like, but may be light, magnetism, or the like. 
     Moreover, instead of a communication device communicable within a predetermined distance, a communication device capable of establishing communication within a larger communicable area may be used. Even in this case, it is possible to execute the above-mentioned process of calculating an arrangement status as long as a receiver is capable of determining the physical distance from a sender of another unit apparatus to some extent and determining if the sender is close to the receiver or not. In other words, even if a receiver is capable of communicating with senders even arranged on adjacent portions other than its vicinal adjacent portions, it is possible to calculate the arrangement status based on data from the senders as long as the receiver is capable of determining if each sender is on a vicinal adjacent portion or a distant position. 
     The integration control apparatus may arbitrarily control, based on the calculated arrangement status, delivery targets of divided images obtained by dividing an image (content) to be displayed, the display orientation, the size of each divided image, and the like. 
     The delivery targets are two-dimensionally arranged image display apparatuses. When displaying the content, the arrangement status of a plurality of two-dimensionally arranged image display apparatuses may be changed in an intended manner. In other words, the position and the orientation of each image display apparatus may be changed. Alternatively, the number of image display apparatuses in use may be changed. As a result, it is possible to improve the design greatly, and offer entertainment. According to the present technology, it is possible to calculate a new arrangement status depending on change of an arrangement status. As a result, it is possible to arbitrarily change delivery targets of divided images, the orientation, the size of each divided image, and the like. As a result, it is possible to display content properly and to use a system properly. 
     In the above-mentioned embodiments, a plurality of image display apparatuses are arranged two-dimensionally, and an image display system is thus constructed. Alternatively, the present technology is applicable to a case where information processing apparatuses other than image display apparatuses are arranged. In other words, the kind of unit apparatuses to be arranged is not limited. For example, a plurality of input apparatuses, each of which receives operations input by a user, may be arrayed as unit apparatuses. For example, a plurality of touchpads are two-dimensionally arrayed, and are used as one large touchpad, i.e., a so-called grid-type touchpad. The present technology is applicable to such a grid-type touchpad. Alternatively, a plurality of unit apparatuses may be various inspection apparatuses or the like. 
     Note that the effects described in the present disclosure are merely examples and are not specifically limited. Moreover, other effects may be obtained. The above-mentioned plurality of effects may be or may not be obtained simultaneously. At least one of the above-mentioned plurality of effects may be obtained depending on conditions or the like. As a matter of course, effects not described in the present disclosure may be obtained. 
     At least two characteristics of the above-mentioned embodiments may be combined. In other words, the characteristics of the above-mentioned embodiments may be combined arbitrarily without distinguishing the embodiments. 
     Note that the present technology may employ the following configurations: 
     (1) An image display apparatus, comprising: 
     a display unit capable of displaying an image; 
     a plurality of adjacent portions arranged on the display unit at a predetermined positional relation; 
     senders capable of sending data via near field communication, the senders being arranged on at least two of the plurality of adjacent portions, respectively; and 
     a receiver capable of receiving data via the near field communication from a sender of another image display apparatus, the receiver being arranged on at least one of the plurality of adjacent portions. 
     (2) The image display apparatus according to the item (1), wherein 
     each of the senders is capable of sending the data within an area including a vicinal adjacent portion, the vicinal adjacent portion being an adjacent portion in the vicinity of the sender out of a plurality of adjacent portions of the other image display apparatus, and 
     the receiver is capable of receiving data from the sender of the other image display apparatus within the area including the vicinal adjacent portion, the sender being arranged on the vicinal adjacent portion. 
     (3) The image display apparatus according to the item (1) or (2), wherein 
     the display unit is a polygon, and 
     each of the plurality of adjacent portions is a vertex portion of the polygon. 
     (4) The image display apparatus according to any one of the items (1) to (3), wherein 
     the display unit is a rectangle, 
     the senders are arranged on four corners, the four corners being the plurality of adjacent portions, and 
     the receiver is arranged on at least a predetermined first corner out of the four corners. 
     (5) The image display apparatus according to the item (4), wherein 
     the receiver is at least arranged on each of the first corner and a second corner out of the four corners, the second corner being diagonal from the first corner. 
     (6) The image display apparatus according to the item (4) or (5), wherein 
     the receiver is arranged on each of the four corners. 
     (7) The image display apparatus according to any one of the items (1) to (3), wherein 
     the display unit is a rectangle, 
     the receiver is at least arranged on a predetermined first corner out of four corners, the four corners being the plurality of adjacent portions, and 
     the senders are arranged on two corners out of three corners excluding the first corner out of the four corners. 
     (8) The image display apparatus according to any one of the items (1) to (7), wherein 
     the display unit has its top and bottom in use, and 
     the tops of the display units of the image display apparatus and the other image display apparatus come to the upper side, and the bottoms come to the lower side. 
     (9) The image display apparatus according to the item (5), wherein 
     the display unit has a long-side direction and a short-side direction, the display unit being capable of being used right side up and upside down, the short-side direction being a vertical direction, and 
     the receiver is arranged on each of the first and second corners. 
     (10) The image display apparatus according to any one of the items (1) to (9), further comprising: 
     a detector capable detecting an arrangement direction. 
     (11) The image display apparatus according to any one of the items (1) to (10), wherein 
     the senders are RFID (Radio Frequency IDentification) tags, and 
     the receiver is an RFID reader. 
     (12) An information processing apparatus capable of controlling at least part of operations of a plurality of unit apparatuses, 
     each of the plurality of unit apparatuses including
         a plurality of adjacent portions having a predetermined positional relation,   senders capable of sending data via near field communication, the senders being arranged on at least two of the plurality of adjacent portions, respectively, and   a receiver capable of receiving data via the near field communication from a sender of another unit apparatus, the receiver being arranged on at least one of the plurality of adjacent portions,       

     the information processing apparatus comprising: 
     a data receiver configured to receive the data, the receiver of each of the plurality of unit apparatuses receiving the data from the sender via the near field communication; and 
     a calculator capable of calculating an arrangement status of the plurality of unit apparatuses based on the received data. 
     (13) The information processing apparatus according to the item (12), wherein 
     each of the senders of each of the plurality of unit apparatuses is capable of sending the data via the near field communication within an area including a vicinal adjacent portion, the vicinal adjacent portion being an adjacent portion in the vicinity of the sender out of a plurality of adjacent portions of the other unit apparatus, 
     the receiver of each of the plurality of unit apparatuses is capable of receiving data from the sender of the other unit apparatus via the near field communication within the area including the vicinal adjacent portion, the sender being arranged on the vicinal adjacent portion, 
     the information processing apparatus further comprises a determining unit capable of
         determining the other unit apparatus including the vicinal adjacent portion on which the sender is arranged based on the data received by the data receiver, the vicinal adjacent portion being in the vicinity of the adjacent portion on which the receiver is arranged, and   determining a position of the vicinal adjacent portion on which the sender is arranged out of the plurality of adjacent portions of the other unit apparatus, and       

     the calculator is capable of calculating an arrangement status of the plurality of unit apparatuses based on a determination result of the other unit apparatus including the vicinal adjacent portion determined by the determining unit, and based on a determination result of the position of the vicinal adjacent portion determined by the determining unit. 
     (14) The information processing apparatus according to the item (13), wherein 
     each of the plurality of unit apparatuses has its top and bottom in use, 
     the tops of the plurality of unit apparatuses come to the upper side, and the bottoms come to the lower side, and 
     the information processing apparatus further comprises a detector capable of detecting an upside-down unit apparatus out of the plurality of unit apparatuses based on the determination result determined by the determining unit. 
     (15) The information processing apparatus according to any one of the items (12) to (14), wherein 
     each of the plurality of unit apparatuses includes a detector capable detecting an arrangement direction, and 
     the calculator is capable of calculating an arrangement status of the plurality of unit apparatuses based on the arrangement direction of each of the plurality of unit apparatuses detected by the detector. 
     It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.