JP2009171272A - Video telephone terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video telephone terminal device, used for a video telephone system, capable of displaying a video while effectively utilizing a high-definition moving image shot by a high-definition camera even if a display screen size is limited. <P>SOLUTION: When starting a video telephone call, displayable sizes for display devices provided with video telephone terminal devices to each other, are exchanged, respectively. When it is determined that a camera shooting size of an own terminal device is larger than the displayable size of an opposite-side terminal, switching of a pickup mode is enabled and coordinate information or the like of a pickup area is transmitted to the opposite-side terminal device. The opposite-side terminal device, which receives the coordinate information or the like of the pickup area, switches to a pickup display mode, switches a screen indication to the pickup area, displays on the display device a message notifying a user about switching to the pickup display, and notifies the user about switching to the pickup display mode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a videophone terminal device that transmits and receives video / audio signals, and more particularly, to a videophone terminal device capable of displaying video suitable for a display device of a partner terminal according to performance information from the partner videophone terminal device. .

  In recent years, videophone systems are becoming more widespread with the speeding up of communication networks and the evolution of video and audio encoding technologies. In these videophone systems, standard protocols such as SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol) are adopted, and not only videophone-dedicated devices but also personal computers, for example, personal computer Various devices such as mobile phones, PDAs (Personal Digital Assistants) can be selected and used.

In addition, the above videophone system notifies the other terminal device of performance specification information such as a decodable video, audio encoding method and video display size of each terminal device when the videophone starts. Based on these performance specification information, the terminal device generally performs enlargement / reduction of the captured image and video / audio encoding, and transmits it to the counterpart terminal device (for example, Patent Document 1).
JP 2003-348556 A

  However, among the videophone terminal devices, there are videophone terminal devices that can make a videophone call with a clear image using a high-definition camera or a display device capable of high-definition display. Although display devices such as mobile phones and PDAs are equipped with high-definition cameras, they are miniaturized from the viewpoint of portability, and as a result, a display size suitable for the screen size is selected. It is. In particular, when a videophone terminal device having such a high-definition camera and a display device with a small display size is used, there is a problem that the current videophone system cannot effectively use high-definition video. In other words, the captured image captured by the high-definition camera is simply reduced and displayed so as to fit within the display screen size of the display device having a small display size, and the video expression utilizing the high definition can be performed. The problem of being unable to do so occurs.

  Therefore, in view of such circumstances, the present invention provides a display device for a videophone terminal device of a counterpart in a videophone system that transmits and receives video and audio between at least two videophone terminal devices. Therefore, it is an object of the present invention to provide a videophone terminal device that can perform video display that effectively utilizes high definition even when the display size of the display screen is small.

  In order to solve the above problems, the videophone terminal device according to the present invention has the following configuration and characteristics.

  The videophone terminal device according to the present invention transmits and receives video / audio between at least two videophone terminal devices, and exchanges performance information of each videophone terminal device at the start of the videophone. In the videophone terminal apparatus, a video input unit for inputting an external video, a display control unit for generating video data for display from the input video, and the video data generated by the display control unit are displayed. A display device, and a rectangular information processing unit that extracts and changes information including a coordinate position of a rectangular region that represents the size of the display device of the counterpart terminal device transmitted from the counterpart terminal device, the display control unit The display size of the display device transmitted from the partner terminal device is compared with the imaging size of the video input unit, and the imaging size is larger than the display size. If it is determined that it is necessary, control is performed to notify the counterpart terminal device of switching to the high size display mode and a high size display start instruction, and a notification that the high size display is started is received from the counterpart terminal device. In this case, instead of displaying the video transmitted from the counterpart terminal device, the video input by the video input unit is reduced to the display size of the display device, and the display frame and the height indicating the position of the rectangular area are displayed. A size display start message is superimposed on the video and displayed on the display device.

  Further, in the videophone terminal device according to the present invention, the video input is performed based on the coordinate value of the rectangular area changed through the rectangular information processing unit after receiving the notification that the high-size display is started. The rectangular area is moved to an arbitrary position in the video obtained by reducing the video of the display to the display size of the display device, the coordinate value of the rectangular area is transmitted to the counterpart terminal device, and the moving display starts from the counterpart terminal device When a notification to the effect is received, a moving display start message is displayed and the display frame is moved.

  Further, in the videophone terminal device according to the present invention, the display control unit receives the notification that the high-size display is started, and then receives the video of the video input unit via the rectangular information processing unit. The fact that the rectangular area is moved to an arbitrary position in the video reduced to the display size of the display device, the coordinate value of the rectangular area is transmitted to the counterpart terminal device, and the moving display is started from the counterpart terminal device. When the notification is received, a moving display start message is displayed and the display frame is moved.

  In the videophone terminal device according to the present invention, the display control unit, on the contrary, arbitrarily selects the rectangular area after receiving a notification from the partner terminal device to switch to the high-size display mode and to issue a high-size display start instruction. When the coordinate value of the rectangular area is transmitted to the counterpart terminal device for moving to the position, and a notification indicating that the movement display is started is received from the counterpart terminal device, a movement display start message is displayed. In addition, the rectangular area is moved.

  According to the videophone terminal device of the present invention configured as described above, the following excellent effects can be obtained.

  According to the videophone terminal device of the present invention, even when the maximum displayable size of the display device is smaller than the imaging size of the high-definition camera to be imaged, video display utilizing the high-definition is possible. The image information displayed on the video can be easily identified.

  In addition, according to the videophone terminal device of the present invention, information such as the coordinate value indicating which rectangular region is displayed in the captured video is received from the counterpart terminal device, and a display frame representing the rectangular region is displayed. By generating, it can be visually confirmed, and the accuracy of the operation when moving in this area can be improved.

  Hereinafter, an embodiment of a videophone terminal apparatus according to the present invention will be described with reference to the drawings.

  1 to 13 are examples of the present embodiment of the videophone terminal device according to the present invention. In the figure, the same reference numerals as those in the figure denote the same parts.

  First, before describing the detailed configuration and operation of the videophone terminal device according to the present invention, the “high-size display mode” that is a feature of the videophone terminal device according to the present embodiment will be briefly described.

  FIG. 1 is a schematic diagram of a videophone system using a videophone terminal device according to the present embodiment.

  FIG. 1 shows a configuration example in which representative videophone terminal devices A, B, and C are connected via a communication network 10 such as the Internet. In a videophone system composed of a plurality of videophone terminal devices connected in this way, for example, the videophone terminal devices A and B establish a communication connection with each other in accordance with the videophone protocol to be used. A videophone call is started by sending video and sound collected by each terminal device to each other terminal device.

  Here, as described above, the video phone terminal device A and the video phone terminal device B often have different encoding processing methods, shooting / display processing capabilities, etc., and each terminal device performs appropriate processing. After establishing a communication connection, it is usual to exchange processing methods and processing capabilities with each other. In particular, the cameras mounted on the videophone terminal devices A and B are high-definition cameras, and the display sizes of the display devices of the videophone terminal devices A and B are mounted on the other terminal device. If the displayable size is small compared to the imaging size of the high-definition camera, the image size is simply adjusted according to the performance of the display devices of the videophone terminal devices A and B. Information must be reduced and transmitted (hereinafter referred to as a low-size display mode), and cannot be operated (hereinafter referred to as a high-size display mode) so as to perform video display utilizing high definition.

  Therefore, the videophone terminal device A according to the present embodiment designates an area of the same size as the display area of the display device of the videophone terminal apparatus B at an arbitrary coordinate position from the entire image captured by the high-definition camera. Information including the coordinate information of the designated area is transmitted to the videophone terminal device B, and the videophone terminal device B switches from the low-size display mode to the high-size display mode based on the information. Thus, a high-size video is displayed and information indicating that the videophone terminal apparatus B has switched to the high-size display mode is received.

  As a result, the videophone terminal device B can display the same high-definition video as the video taken by the videophone terminal device A, and the videophone terminal device B is displaying high resolution. This makes it possible to confirm the convenience and accuracy of the operation when performing an area moving operation to an arbitrary position, which will be described later.

  Next, the configuration and operation of the videophone terminal device according to the present invention that performs the video display operation in the high-size display mode will be described.

  FIG. 2 is a block diagram showing the configuration of the videophone terminal device.

  The videophone terminal device 20 includes a high-definition camera (video input unit) 21 for capturing external video, a microphone 22 for collecting user's voice and surrounding voice, and a display device of the counterpart terminal device. A key input device 23 for enabling the user to specify parameter information such as the size and coordinates of a rectangular area to be displayed, a video encoding unit 24 for compressing image data captured by the high-definition camera 21, and a microphone 22 A speech encoding unit 25 that compresses the speech data collected by the terminal, a rectangular information processing unit 26 that extracts and changes coordinate value information of a rectangular region transmitted from the counterpart terminal device, and encoded image data A transmission processing unit 27 that packetizes information about audio data and rectangular areas, a transmission / reception unit 28 that transmits and receives packets, and a packet received from a partner terminal And a video processing unit that decodes video data encoded based on the received rectangular area information obtained by the received rectangular information processing unit 26. Rectangular information in the encoding unit 30, the audio decoding unit 31 that decodes the received encoded audio data, the video data decoded by the video decoding unit 30 or the video data captured by the high-definition camera 21. The display control unit 32 that generates video data reflecting the information of the rectangular area obtained by the processing unit 26, the display device 33 that displays the video data generated by the display control unit 32, and the decoded audio data And a general control unit 35 that controls the entire apparatus including the videophone protocol.

  In addition, since the mobile phone terminal is assumed as the videophone terminal device 20 of this embodiment, the imaging size of the high-definition camera 21 is assumed to be 1920 × 1080 pixels, and the display size of the display device 33 is assumed to be 800 × 480 pixels. However, it is not limited to these sizes.

  FIG. 3 is a flowchart showing processing operations from the videophone line connection to the start of the videophone in the videophone terminal apparatus 20.

  As shown in FIG. 3, when starting a videophone call, the overall control unit 35 first makes a videophone call to a partner terminal device in order to establish a videophone line (step S100). ). After making a call, the terminal waits for a response from the partner terminal device, performs response confirmation processing (step S110), and completes the connection of the videophone line.

  Subsequently, as described above, the processing methods and processing capability specifications of the terminal devices are exchanged (step S120). In the processing capability specification exchange process in step S120, as shown in FIG. 4, an identifier 40 indicating an available image / sound transmission side encoding method, a captured image capture size 41, and a receivable image size. In addition to exchanging information such as 43, the maximum value 44 of the image size that can be displayed on the display device is also exchanged. Then, a process is performed to determine whether or not the maximum display size of the display device of the counterpart terminal device is smaller than the imaging size of the high-definition camera 21 (step S130). Switching to the display mode (hereinafter referred to as pickup mode) is enabled (step S140), and a videophone start process is performed (step S150). In the videophone start process, the pickup mode can be used, and actual high-size display (hereinafter referred to as pickup display) is performed as necessary.

  On the other hand, if it is determined that it is larger (step S130; No), the videophone start process is performed as it is (step S150). In this case, the camera image size is displayed as it is or enlarged to the display size of the display device.

  Next, an instruction to start pickup display by the videophone terminal device 20 and an operation flow after the start will be described with reference to FIGS.

  FIG. 5 is a diagram illustrating a configuration example of a screen of the videophone terminal device A and the videophone terminal device B during the pickup mode effective period.

  (A) is a figure which shows the pick-up area | region display frame produced | generated during the pick-up mode effective period and the image imaged with the high-definition camera of the video-phone terminal device B, (b) It is a figure which shows the received image from the videophone terminal device A. FIG. Further, (c) is a diagram showing a reduced screen displayed on the display device of the videophone terminal device B at the time of pick-up display start instruction. Furthermore, (d) is a diagram showing a screen displayed on the videophone terminal apparatus B as pick-up display.

  As shown in (b), in this embodiment, the videophone terminal apparatus B receives a high-capacity image captured by the videophone terminal apparatus A, but from the viewpoint of transmission efficiency. , (C), (d), the reduced display screen and the pickup display screen may be created on the videophone terminal device A side and transmitted to the videophone terminal device B.

FIG. 6 is a diagram showing an execution sequence of pick-up display between the videophone terminal apparatuses A and B. (A) is a figure which shows a pick-up display start sequence, (b) is a figure which shows a sequence in case the movement start instruction | indication of a pick-up area | region is performed from the videophone terminal device A. FIG. Further, (c) is a diagram showing a sequence in the case of instructing the pickup area movement start from the videophone terminal device B.
Note that these pickup instructions are performed by transmitting and receiving a message included in the data structure shown in FIG.
FIG. 8 is a flowchart showing the flow of processing at the start of the pickup mode. 8A is a flowchart showing the process flow of the videophone transmission / reception terminal A instructing the start of the pickup mode, and FIG. 8B is a flowchart showing the process flow of the videophone transmission / reception terminal B receiving the pickup mode instruction. is there.

[Explanation of pickup display start]
First, the pickup display start sequence (steps S510 to S530) and FIG. 8 (steps S800 to S840; steps S850 to S910) shown in FIG. 6A will be described.
When the switch to the pickup mode is enabled (the process of step S140 in the flow shown in FIG. 3), the videophone terminal apparatuses A and B (the switch to the pickup mode is also enabled in B) 5A, as shown in FIG. 5 (a), the display device 33 normally has a rectangular display (pickup region display frame 50 indicating a video and a pickup region captured by the high-definition camera of the counterpart terminal device B). ) Appears. In this state, when the user A of the videophone terminal device A operates the pickup display start instruction key of the key input device 23, the pickup display start instruction is displayed and controlled via the rectangular information processing unit 26 and the overall control unit 35. At the same time as being transmitted to the unit 32, it is transmitted to the videophone terminal apparatus B. Then, the display device 33 switches to the display of the pick-up area display frame 50 representing the video and the pick-up area taken by the own high-definition camera.
On the other hand, as shown in FIG. 5C, the display control unit 32 of the counterpart terminal apparatus B generates a reduced video image that matches the size of its own display apparatus. The reduced video is displayed on the display device of the partner terminal device B, and a pickup area display frame 50 having the same display size as the counterpart terminal device is displayed on the reduced video (shown in FIG. 5C). The user B can know the selected area. The displayed pickup area display frame 50 can be moved in the display area by the above-described operation by the user A, and a rectangular area to be picked up can be selected from the display screen. Here, the initial coordinate value of the pickup area display frame 50 is, for example, the center position of the screen.

In addition, as a selection method in the case of designating the coordinate position of the pickup area, for example, in a coordinate system based on the upper left pixel of the photographed image by a key input device including a cross key, the pickup area display frame can be displayed with the cross key. There is a method of designating the coordinates of 50 upper left corners.
When the selection of the pickup area is completed, the selected coordinates are included in the message shown in FIG. 7 and transmitted to the videophone transmission / reception terminal B which is the communication partner of the videophone. The videophone transmission / reception terminal A that has transmitted the message waits for a response from the videophone transmission / reception terminal B. On the other hand, the videophone transmitting / receiving terminal B that has received the message including the pickup coordinates generates a pop-up display (pop-up character (P)) 51 indicating that the pickup instruction has been received on the currently displayed image. During the pop-up display, the key input device, for example, by pressing the enter key, obtains the upper left coordinate of the pickup rectangle from the received message, obtains the pickup rectangular area of the received image, and displays the received image in a reduced size Instead of reducing the received image from the screen, as shown in FIG. 5D, it is possible to switch to the pickup screen display in which a part of the image is cut out while maintaining the original size.

The videophone transmitting / receiving terminal B that has started the pickup display transmits a message for notifying the videophone transmitting / receiving terminal A that the pickup display has started. On the screen display of the videophone transmission / reception terminal A that has received the pickup display start message, a pop-up is displayed to indicate that the videophone transmission / reception terminal B, which is the counterpart terminal, is displaying the pickup. This pop-up display continues to be displayed until the videophone transmitting / receiving terminal B finishes the pickup display.
Here, the pop-up display is performed to indicate that the partner terminal is in the pick-up display, but the means for notifying the user is not limited to this means, and other visual notification means. Alternatively, auditory means such as voice or tactile means such as vibration of the terminal may be used.

  In addition, after the pickup display start instruction from the videophone terminal device A, the videophone terminal device B issues a pickup display start / end instruction until the connection of the videophone line between the videophone terminal devices A and B is canceled. Notification can be made to the videophone terminal device A.

  Further, even during the period when the pop-up character (P) 51 is displayed, the display device 33 of the videophone terminal device A displays the television from the video of its own high-definition camera 21 shown in FIG. It is possible to switch to the video shot by the camera of the telephone terminal device B and display the video shot by the partner terminal device B at any time.

[Explanation of Pickup Area Movement Based on Instruction from Videophone Terminal Device A]
Next, a sequence process in the case where the movement of the pickup area is started based on an instruction from the videophone terminal device A that is capturing a high-definition image during pickup display will be described with reference to FIGS. .
Here, FIG. 9 shows the state of the screen display of the pickup area movement, and FIG. 10 shows the flow of processing. 10A (steps S1000 to S1040) shows the flow of processing of the videophone transmitting / receiving terminal A instructing the pickup display, and FIG. 10B (steps S1100 to S1150) is the television receiving the instruction of the pickup display. The flow of processing of the telephone transmitting / receiving terminal B is shown.

In the videophone transmission / reception terminal A that is capturing a high-definition image during pickup display, the pickup area can be moved by operating the cross key on the key input device.
When the pick-up area is moved in the direction of the arrow 52 by the cross key operation and the enter key and the pick-up rectangular area is re-designated, as shown in FIG. 9A, the coordinates of the rectangular area at the re-designated position are displayed. Is included in the message shown in FIG. 7 and transmitted to the videophone transmitting / receiving terminal B, which is the counterpart terminal, as a pickup location update message. In the videophone transmission / reception terminal B that has received the message, as shown in FIG. 9B, a pop-up (pop-up character (M)) 53 for notifying that the update message for the pickup rectangular area has been received is displayed. During the pop-up display, the pickup display position can be updated by, for example, pressing the enter key in the key input device. In the videophone transmission / reception terminal B, when update of the pickup display position is selected by the enter key or the like, the upper left coordinate of the new pickup rectangular area is acquired from the received message, and the pickup area is updated and reflected on the display screen. When the update of the pickup display position is completed, a message is transmitted to notify the videophone transmitting / receiving terminal A that the pickup display position has been updated. The videophone transmitting / receiving terminal A that has received the message notifies the user A that the update has been reflected, for example, by highlighting the pickup area rectangle on the display screen.

[Description of Pickup Area Movement Based on Instruction from Videophone Terminal Device B]
In addition, an instruction to move the pickup area can be issued from the videophone transmission / reception terminal B. In the videophone transmission / reception terminal B, the position of the display screen can be moved, for example, by operating the cross key on the key input device during the pickup display. The screen display at that time is shown in FIG. 11, and the flow of processing is shown in FIG. 12A (steps S1210 to S1290) shows the processing flow of the videophone transmitting / receiving terminal A instructing the pickup display, and FIG. 12B (steps S1250 to S1290) gives the instruction of the pickup display. The flow of processing of the videophone transmission / reception terminal B operating the reception and pickup display position is shown.

  In the videophone transmission / reception terminal B, when the user performs a cross key operation, the movement amount in the movement of the pickup rectangular area generated by the operation is obtained, the pickup rectangular area is calculated from the movement amount, and the videophone transmission / reception terminal B The display at is updated. After the display is updated, the movement amount of the pickup rectangular area is included in the message shown in FIG. 7, and the message is transmitted to the videophone transmitting / receiving terminal A. The videophone transmission / reception terminal A that has received the message acquires the amount of movement from the message, calculates the position displayed on the videophone transmission / reception terminal B, and, as shown in FIG. A pick-up rectangle representing the area that the user is viewing is displayed. According to the display, the videophone transmission / reception terminal A can match the pickup rectangle designated on the videophone transmission / reception terminal A to the pickup rectangle representing the viewing area of the videophone transmission / reception terminal B by the above movement instruction means.

  Note that the videophone terminal device of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

1 is a schematic diagram of a videophone system using a videophone terminal device according to the present embodiment. It is a block diagram which shows the structure of the videophone terminal device which concerns on this embodiment. It is a flowchart which shows the flow of a process from the line connection of the videophone in the videophone terminal device which concerns on this embodiment to the start of a videophone. In the videophone transmitting / receiving terminal of the present invention, it is a diagram showing the structure of data included in a message for exchanging capability specifications between videophone transmitting / receiving terminals. It is a figure which shows the structural example of the screen of the videophone terminal device A and the videophone terminal device B in a pick-up mode effective period. It is a figure which shows the implementation sequence of the pick-up display between videophone terminal device A and B. FIG. FIG. 4 is a data structure diagram showing a structure of data included in a message exchanged when starting a pickup mode, moving a pickup area, or the like in the videophone transmission / reception terminal of the present invention. It is a flowchart which shows the flow of a process at the time of pickup mode start. (A) is a flowchart showing the processing flow of the videophone transmitting / receiving terminal A instructing the start of the pickup mode, and (b) is a flowchart showing the processing flow of the videophone transmitting / receiving terminal B receiving the pickup mode instruction. It is explanatory drawing which shows the mode of the screen display of a pick-up area movement. In the videophone transmitting / receiving terminal of the present invention, in the movement of the pickup area, an update instruction for the pickup position from the pickup instructing side (A) and an update operation of the side receiving the pickup instruction (B) It is a flowchart of a process. It is a flowchart which shows the movement of a pick-up area | region when starting the movement of a pick-up area | region from the videophone terminal device which is picking-up displayed. FIG. 11 is a flowchart of data processing related to the movement operation of the pickup area from the videophone transmission / reception terminal B that has received the pickup instruction to the videophone transmission / reception terminal A that has instructed the pickup during movement of the pickup area. It is a schematic diagram of a display screen change in the videophone transmission / reception terminal on the captured image receiving side when the pickup display is moved.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Communication network 20 Videophone terminal device 21 High-definition camera 22 Microphone 23 Key input device 24 Video encoding part 25 Audio encoding part 26 Rectangular information processing part 27 Transmission processing part 28 Transmission / reception part 29 Reception processing part 30 Video decoding part 31 Audio decoding unit 32 Display control unit 33 Display device 34 Speaker 35 Overall control unit 40 Identifier 41 indicating transmission side encoding method Captured image size 43 Receivable image size 43 Displayable image size maximum value 50 Pickup Area display frame 51 Pop-up character (P)
52 Arrow 53 Popup letter (M)

Claims (4)

In a videophone terminal device of a videophone system that transmits and receives video and audio between at least two videophone terminal devices and exchanges performance information of each videophone terminal device with each other at the start of the videophone.
A video input unit for inputting an external video, a display control unit for generating video data for display from the input video, a display device for displaying the video data generated by the display control unit, and a partner terminal device A rectangular information processing unit that extracts and changes information including the coordinate position of the rectangular region that represents the size of the display device of the counterpart terminal device transmitted from
The display control unit compares the display size of the display device transmitted from the counterpart terminal device with the imaging size of the video input unit, and determines that the imaging size is larger than the display size. Control is made to notify the counterpart terminal device of switching to the mode and a high-size display start instruction, and transmission from the counterpart terminal device when notification of the start of high-size display has been received from the counterpart terminal device Instead of displaying the video to be displayed, the video input by the video input unit is superposed on the video by reducing the video to the display size of the display device, the display frame indicating the position of the rectangular area, and the high-size display start message. The videophone terminal device is characterized in that it is displayed on the display device.   Conversely, when the display control unit receives a notification from the counterpart terminal device for switching to the high size display mode and a high size display start instruction, the display control unit reduces the video transmitted from the counterpart terminal device and receives the received video. 2. The control according to claim 1, wherein the mode is switched from the mode for displaying the whole to the mode for displaying the rectangular area, and control is performed to transmit a notification to the effect that the high-size display is started to the counterpart terminal device. Videophone terminal device.   The display control unit displays the video of the video input unit based on the coordinate value of the rectangular area changed via the rectangular information processing unit after receiving the notification that the high-size display start has been performed. Notification that the rectangular area is moved to an arbitrary position in the video reduced to the display size of the apparatus, the coordinate value of the rectangular area is transmitted to the counterpart terminal apparatus, and the moving display is started from the counterpart terminal apparatus 2. The videophone terminal device according to claim 1, wherein when the mobile phone is received, a moving display start message is displayed and the display frame is moved.   Conversely, the display control unit receives the notification from the partner terminal device for switching to the high-size display mode and a high-size display start instruction, and then moves the rectangular region to an arbitrary position. When the coordinate value of the rectangular area is transmitted and a notification indicating that the moving display is started is received from the counterpart terminal device, the moving display start message is displayed and the rectangular area is moved. The videophone terminal device according to claim 2.

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