JP2018007059A - Communication device, communication control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct efficient communication corresponding to capability of a communication opposite party external device.SOLUTION: A communication device includes: reception means for receiving capability information on reception capability of an external device before completion of connection with the external device; determination means for determining whether the external device can receive transmission object information on the basis of the capability information; change means for changing the transmission object information if the determination means has determined that the external device cannot receive the transmission object information; and transmission means for transmitting information after change by the change means.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a communication device, a communication control method, and a program.

  With the spread of wireless communication, it is considered that portable terminals such as digital cameras have a wireless communication function and transmit image files and the like. For example, when data communication is performed using a wireless LAN, the mobile terminal participates in the wireless LAN network and then establishes communication with an external device in the network. Patent Document 1 discloses a technique for converting an image to be transmitted into a file having a data amount suitable for the usable amount of memory and output performance of the external device in order to transfer and display the image on the external device. Has been.

JP 2003-60952 A

  However, in the prior art, in order to acquire information on the external device, it is first necessary to complete the connection with the external device. In such a case, for example, when it is determined that data cannot be transmitted as a result of acquiring information on the external device after connection, the connection itself is wasted.

  The present invention has been made in view of such problems, and an object of the present invention is to perform efficient communication according to the capability of the external device of the communication partner.

  Therefore, the present invention is a communication device, and before completing connection with an external device, receiving means for receiving capability information related to the reception capability of the external device, and based on the capability information, A determination unit that determines whether or not the external device can receive information; and when the determination unit determines that the external device cannot receive the information to be transmitted, the information to be transmitted is changed. It has a change means and the transmission means which transmits the information after the change by the said change means, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, efficient communication can be performed according to the capability of the external apparatus of a communicating party.

It is a figure which shows a communication system. It is a figure which shows the hardware constitutions of a camera. It is a figure which shows the software structure of a camera. It is a communication sequence diagram of a communication system. It is a figure which shows the example of a display of the display part of a mobile telephone. It is a figure which shows the example of a display of the display part of a mobile telephone. It is a flowchart which shows the process of a camera. It is a flowchart which shows the process of the camera which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a communication system 100 according to the first embodiment. The communication system 100 includes a camera 110 and a mobile phone 120. The camera 110 and the mobile phone 120 are connected via a network 130. Here, the camera 110 and the mobile phone 120 are both examples of communication devices. In this embodiment, a case where an image is transmitted from the camera 110 to the mobile phone 120 will be described as an example. However, an image can be transmitted from the mobile phone 120 to the camera 110 in the same manner. In the present embodiment, a case where the communication system 100 is a wireless LAN system compliant with the IEEE 802.11 series will be described as an example. However, the communication form is not necessarily limited to a wireless LAN compliant with IEEE 802.11.

  FIG. 2 is a diagram illustrating a hardware configuration of the camera 110. A control unit 201 controls the entire apparatus by executing a control program stored in the storage unit 202. The control unit 201 includes one or more processors such as a CPU and an MPU. The control unit 201 also performs communication parameter setting control with other devices. A storage unit 202 stores a control program executed by the control unit 201 and various types of information such as communication parameters. The storage unit 202 may store image data, files, and the like generated by the camera 110 or received from an external device. The storage unit 202 includes various memories such as a ROM, a RAM, an HDD, and a flash memory. Various operations of the camera 110 described later are performed by the control unit 201 executing a control program stored in the storage unit 202.

  Reference numeral 203 denotes a wireless unit for performing wireless LAN communication conforming to the IEEE 802.11 series. Reference numeral 204 denotes a display unit that performs various displays, and has a function capable of outputting visually recognizable information such as an LCD or LED, or outputting sound such as a speaker. The display unit 204 has a function of outputting at least one of visual information and sound information. 205 is an antenna control unit, and 206 is an antenna. The antenna control unit 205 controls the antenna 206 to transmit and receive signals by wireless communication.

  An operation unit 207 is used by the user to perform various inputs and operate the communication apparatus. The operation unit 207 includes various buttons, a touch panel, and the like. Reference numeral 208 denotes a photographing unit. The photographing unit 208 includes an optical lens, a CMOS sensor, a digital image processing unit, and the like, and converts an analog signal input via the optical lens into digital data to generate image data. Image data generated by the imaging unit 208 is stored in the storage unit 202.

  Note that the hardware configuration of the camera 110 illustrated in FIG. 2 is an example, and the camera 110 may further include a hardware configuration other than the hardware configuration illustrated in FIG. 2. The hardware configuration of the mobile phone 120 is the same as the hardware configuration of the camera 110.

  FIG. 3 is a diagram illustrating a software configuration of the camera 110. Reference numeral 301 denotes a Discovery control unit that operates a search process for searching for a communication device as a communication partner. 302 is a GO Negotiation control unit. The GO Negotiation control unit 302 performs control based on the Wi-Fi Direct protocol specification. The GO Negotiation control unit 302 determines a role in the wireless layer such as which is a wireless LAN access point and which is a wireless LAN station between communication apparatuses. In Wi-Fi Direct, a communication device that performs a wireless LAN access point function is referred to as a P2P group owner (hereinafter referred to as GO), and a communication device that performs a wireless LAN station function is referred to as a P2P client (hereinafter referred to as CL). When it is a GO or wireless LAN access point, a later-described wireless LAN access point function control unit 310 is activated, and when it is a CL or wireless LAN station, a later-described wireless LAN station function control unit 309 is activated.

  The GO Negotiation protocol is determined by the Wi-Fi Direct specification. In Wi-Fi Direct, a network constructed by GO is referred to as a P2P group. Also in this embodiment, the network may be described as a P2P group. In the present embodiment, these are described with the same meaning. The P2P group owner (GO), the P2P client (CL), and the communication device group whose role has not been determined are collectively referred to as a P2P device.

  A DHCP client control unit 303 is activated when the GO Negotiation control unit 302 changes its role to a wireless LAN station. Reference numeral 304 denotes a DHCP server control unit, which is activated when the role of its own device becomes a wireless LAN access point in the GO Negotiation control unit 302.

  A WPS enrollee control unit 305 receives communication parameters necessary for wireless LAN communication from other WPS registrar devices. Similar to the DHCP client control unit 303, the WPS enrollee control unit 305 operates when the role of its own device is a wireless LAN station. A WPS registrar control unit 306 provides communication parameters required for wireless LAN communication to other WPS enrollee devices. Similar to the DHCP server control unit 304, the WPS registrar control unit 306 operates when the role of its own device is a wireless LAN access point. Note that the communication parameters provided by the WPS registrar are parameters such as an SSID as a network identifier, an encryption key, an encryption method, an authentication key, and an authentication method.

  Reference numeral 307 denotes a wireless LAN packet receiving unit, and reference numeral 308 denotes a wireless LAN packet transmitting unit, which controls transmission / reception of all packets including higher-layer communication protocols. Reference numeral 309 denotes a wireless LAN station function control unit. The wireless LAN station function control unit 309 performs authentication / encryption processing when the device itself operates as a wireless LAN station, and participates in a wireless network constructed by a device operating as a wireless LAN access point. A wireless LAN access point function control unit 310 constructs a wireless network when the own apparatus operates as a wireless LAN access point function, and performs authentication / encryption processing, management of a communication partner apparatus, and the like. The wireless LAN station function control unit 309 and the wireless LAN access point function control unit 310 can operate either one or simultaneously.

  A packet routing control unit 311 bridges and routes a communication packet when the wireless LAN access point function control unit 310 is operating. A data storage unit 312 stores and holds software itself, wireless LAN parameters, and various tables such as the above-described DHCP address table and ARP table.

  Reference numeral 313 denotes a service discovery control unit, which manages a service discovery function unique to Wi-Fi Direct. The service discovery function exchanges service information held by the counterpart communication device by transmitting and receiving action frames defined by IEEE 802.11u. Specifically, the service discovery function transmits an SD Query and receives an SD Response as a response. Alternatively, the service discovery function receives an SD Query from the counterpart device and transmits an SD Response as a response. Information indicating the type of service is included in the SD Response. Specifically, the types such as a file transfer service, a print service, and a moving image streaming service are indicated.

  Reference numeral 314 denotes a P2P invitation function control unit which controls the invitation function defined by the Wi-Fi Direct standard. The invitation function is omitted because it is defined in the Wi-Fi Direct specification, but it is a function that prompts a P2P device for which a GO device or CL device has no determined role as a P2P client.

  Reference numeral 315 denotes an application layer service providing unit that provides an application layer file transfer service. The application layer here refers to a service providing layer in an upper layer higher than the fifth layer in the OSI reference model. The file transfer service performs transmission / reception of various request responses and transmission / reception processing of transfer files using the HTTP protocol. Reference numeral 316 denotes an application layer service utilization unit in the application layer. The file transfer service using unit 316 uses a service provided by the file transfer service providing unit in the application layer of the opposite device.

  Reference numeral 317 denotes a session management unit that manages logical connections in the file transfer service. When using the file transfer service, the session management unit 317 transmits information on the transfer file, transmits a session generation request to the counterpart communication device, and receives a response. When providing a file transfer service, the session management unit 317 determines whether or not a session can be generated based on the content of the received transfer file information, and responds. The transfer file information is information including the number of files, the total size, and the file name. When it is determined that the session can be generated, the session management unit 317 performs connection processing in the wireless layer. Information related to session management is exchanged using a public action frame defined by IEEE 802.11.

  Note that the functional units shown in FIG. 3 are not limited to those provided by software, and at least a part thereof may be provided by hardware. And each function part shown in FIG. 3 has a mutual relationship. The software configuration illustrated in FIG. 3 is an example, and a plurality of functional units may configure one functional unit, or any of the functional units may further include a plurality of functional units.

  In this embodiment, the file transfer service in the application layer is realized by a device that provides the service and a device that uses the service. The service providing device and the service using device can be applied to a mobile phone, a smartphone, a tablet, a digital camera, and the like.

  FIG. 4 is a sequence diagram showing communication control processing of the communication system 100 when a stored image file is transferred to the mobile phone 120 to the camera 110. FIG. 4 shows processing when the camera 110 is a communication device on the transmission side that uses the file transfer service, and the mobile phone 120 is a communication device on the reception side that provides the file transfer service.

  In step S401, the control unit 201 of the camera 110 receives an instruction to start an image transfer mode by a user operation. Then, in order to use the file transfer service, the control unit 201 of the camera 110 transmits an inquiry signal for searching for a communication device that provides the service. The control unit 201 of the camera 110 performs transmission by adding information on the name of the transmission side device, the MAC address, and the type of service to be connected to the inquiry signal.

  In step S <b> 402, the control unit 201 of the mobile phone 120 transmits a detection response signal to the camera 110. The control unit 201 of the mobile phone 120 transmits the detection response signal by adding the device name, MAC address, and possible service type information of the receiving side (self device). Next, in S403, when receiving the detection response, the control unit 201 of the camera 110 transmits a session generation request signal (action frame) to establish a logical connection between the mobile phone 120 and the file transfer service. The control unit 201 of the camera 110 performs transmission by adding the MAC address on the transmission side and information on possible service types to the session generation request signal.

  Next, in S404, when receiving the session generation request signal (action frame), the control unit 201 of the mobile phone 120 transmits a detection response signal (action frame) for the session request signal. The control unit 201 of the mobile phone 120 transmits the detection response signal (action frame) by adding the MAC address, capability information, and possible service type information of the receiving side (own device). Here, the capability information is information indicating the data reception capability of the mobile phone 120 in communication connection. The capability information in the present embodiment is information relating to the amount of data that can be received by the receiving device. More specifically, the capability information is information indicating the maximum amount of data that can be received. Here, the maximum receivable data amount is a value determined according to the free capacity of the storage unit 202 of the mobile phone 120.

  In step S <b> 405, the control unit 201 of the camera 110 determines whether file transfer of the transfer file is possible based on the reception capability information of the mobile phone 120 serving as a receiving device. Do. Specifically, the control unit 201 of the camera 110 can transfer a file when the receivable data amount (free capacity of the storage unit 202) indicated by the capability information is equal to or larger than the data size of the transfer file. Is determined.

  Note that the connection between the camera 110 and the mobile phone 120 has not been established at the end of S404. More specifically, at the end of S404, services related to the communication connection are mutually specified, and communication at the application layer is not established. Although a so-called service search is performed at the timings of S401 and S402, communication in the application layer between the camera 110 and the mobile phone 120 has not been established. As described above, the camera 110 can receive and check the capability information of the receiving device at a timing before the connection between the camera 110 and the mobile phone 120 is completed. Therefore, the camera 110 can determine whether or not file transfer is possible before the communication connection with the mobile phone 120 is completed. Furthermore, when the camera 110 determines that transfer is not possible, it can reselect a file to be transferred in accordance with a user instruction. Further, at the end of S404, the camera 110 and the mobile phone 120 do not necessarily require connection in the wireless layer (belonging to the same wireless network). In this case, the process up to S404 is executed using the action frame, and the process in which the camera 110 and the mobile phone 120 belong to the same network is executed in S405. For this process, for example, Wi-Fi Direct can be used.

  Note that the mobile phone 120 may be a communication device on the transmission side that uses the file transfer service, and the camera 110 may be a communication device on the reception side that provides the file transfer service. In this case, the camera 110 may perform the process shown as the process of the mobile phone 120 in FIG. 4, and the mobile phone 120 may perform the process shown as the process of the camera 110 in FIG.

  5 and 6 are diagrams showing display examples of the display unit 204 of the camera 110. FIG. The user operates the camera from the playback screen on which the image is displayed, and selects the image to be transmitted. Although detailed description of image selection is omitted, in the present embodiment, an example of using the image narrowing selection function of the camera 110 is used. Not only the narrowing selection function but also a method of selecting images individually.

  As shown in FIG. 5A, the function menu is displayed on the image in a state where the image is narrowed down by the tag information previously attached to the date and the image. The user selects a transfer item from the function menu. In the screen example of FIG. 5A, the top item is transfer. When a transfer item is selected, a transfer destination selection menu is displayed as shown in FIG. In the example of FIG. 5B, two items of transfer to the mobile phone and print from the printer are displayed. When connecting to the mobile phone 120, the mobile phone item in FIG. 5B may be selected.

  When the mobile phone item is selected, as shown in FIG. 5C, the screen of the camera 110 transitions to a connected screen, and the camera 110 performs a connection process with the mobile phone 120 selected as the connection destination device. To start. The camera 110 acquires capability information of the mobile phone 120 as a receiving device during the display of the screen of FIG. If the image file to be transmitted can be transmitted, the camera 110 performs connection processing between the counterpart device and the transfer service. Then, after the connection is completed, the camera 110 displays the screen shown in FIG. 5D and starts file transfer.

  If the camera 110 determines that the receiving device cannot receive the file to be transmitted, the camera 110 displays the screen of FIG. 6A and selects whether to reselect the image to be transmitted to the user. When OK is selected here, the camera 110 displays the screen of FIG. Then, the user reselects the image. When the data size of the image file selected as the transmission target is equal to or smaller than the amount of data that can be received by the mobile phone 120 as the receiving device, the GUI button is activated so that the transition to transmission can be made. Thereby, the user can grasp whether or not transfer to the mobile phone 120 is possible.

  When cancel is selected on the screen of FIG. 6A, the camera 110 stops the transmission of the file to the mobile phone 120 as a receiving device. When the camera 110 accepts a transmission instruction on the screen of FIG. 6B, the camera 110 displays the connecting screen of FIG. 5C, and performs transfer service connection processing with the mobile phone 120 as the receiving device. Since there is a possibility that the transmission destination may disappear while the image is selected again, the camera 110 re-searches the connection destination while the screen of FIG. 5C is displayed. When the connection of the transfer service with the mobile phone 120 is completed, the camera 110 displays the screen of FIG. 5D and starts transmitting the image file to the mobile phone 120.

  FIG. 7 is a flowchart showing detailed processing of the camera 110 corresponding to the processing shown in FIG. Each step of this flowchart is a process realized by the control unit 201 of the camera 110 executing a program stored in the storage unit 202 of the camera 110.

  In step S <b> 701, when the control unit 201 of the camera 110 receives an instruction to start image transfer via the operation unit 207 of the camera 110, the control unit 201 displays a connected screen on the display unit 204. Then, the control unit 201 of the camera 110 notifies the connection desired service by transmitting an inquiry signal including, as a search condition, a service to be used for transfer, that is, a service desired to be connected. Next, in step S702, when the control unit 201 detects a partner apparatus that can execute the service desired to be connected (Yes in step S702), the control unit 201 advances the process to step S703. In step S <b> 703, the control unit 201 receives capability information from the mobile phone 120 that has received the image transfer start instruction.

  Next, in step S <b> 704, the control unit 201 determines whether the mobile phone 120 as a receiving device can receive the image file to be transmitted. Specifically, the control unit 201 determines that the receiving device is receivable when the data size of the image file to be transmitted is equal to or less than the maximum data amount that can be received by the mobile phone 120 as indicated by the capability information. . In addition, when the data size of the image file to be transmitted is larger than the maximum data amount that can be received by the mobile phone 120, the control unit 201 determines that the receiving device cannot receive the data. When the data size of the transmission target data is equal to or less than the maximum data amount that can be received by the receiving device, that is, when it is determined that the data can be received (Yes in S704), the control unit 201 advances the processing to S708. If the data size of the transmission target data is larger than the maximum data amount that can be received by the receiving device, that is, if it is determined that reception is impossible (No in S704), the control unit 201 advances the processing to S705.

  In step S <b> 705, the control unit 201 displays a selection screen for accepting an instruction to continue or cancel the transmission of the image file on the display unit 204 and accepts an instruction input according to a user operation. When the control unit 201 receives an instruction to continue transmission (image reselection) (image reselection in step S705), the control unit 201 advances the processing to step S706. When the control unit 201 receives an instruction to stop transmission (disconnect) (disconnect in step S705), the control unit 201 advances the processing to step S710. In step S710, the control unit 201 performs processing for disconnecting communication with the mobile phone 120 serving as a receiving device, and ends the processing. That is, the control unit 201 controls not to transmit the transmission target data when it is determined that the data size of the transmission target data is larger than the maximum amount of data that can be received by the receiving device and cannot be received. . This process is an example of a transmission control process.

  In step S <b> 706, the control unit 201 displays an image selection screen on the display unit 204 and reselects a transmission target image file in accordance with a user operation. At this time, if the total data size of the selected image file exceeds the maximum amount of data that can be received by the receiving device, the control unit 201 cannot perform a transmission operation such as preventing the transmission button from being pressed. May be. The information to be transmitted is changed by reselecting the image file. That is, the process of S706 is an example of a change process that changes information to be transmitted.

  Next, in S707, when the data size of the image file to be transmitted after reselection is equal to or smaller than the maximum data amount that can be received by the receiving device (Yes in S707), the control unit 201 advances the process to S708. . In step S <b> 708, the control unit 201 starts connection processing for a transfer service to the mobile phone 120 as a receiving device. This corresponds to the process of S405 in FIG. After the transfer service connection process to the mobile phone 120 is completed, in step S709, the control unit 201 transmits the image file to be transmitted after reselection (after change) in step S706 to the receiving device. Above, the process of the camera 110 is complete | finished.

  As described above, the camera 110 as the communication device according to the present embodiment can receive the capability information before the communication connection is completed, and can change the information to be communicated according to the communication capability of the receiving device. . Therefore, the camera 110 can perform efficient communication according to the capability of the external device of the communication partner.

(Second Embodiment)
Next, a communication system 100 according to the second embodiment will be described. In the communication system 100 according to the second embodiment, the capability information is information indicating a data format that can be handled by the receiving device. That is, the communication apparatus according to the second embodiment checks the data format that can be handled by the receiving device before the communication connection is completed, and controls communication.

  FIG. 8 is a flowchart showing detailed processing of the camera 110 according to the second embodiment. The camera 110 according to the second embodiment executes the process shown in FIG. 8 instead of the process shown in FIG. The processes in S801 and S802 are the same as the processes in S701 and S702, respectively. The control unit 201 of the camera 110 advances the process to S803 after the process of S802. In step S <b> 803, the control unit 201 receives information indicating a data format that can be handled by the mobile phone 120 as capability information from the mobile phone 120 as a receiving device.

  Next, in step S <b> 804, the control unit 201 determines whether the mobile phone 120 as a receiving device can receive the image file to be transmitted. Specifically, the control unit 201 can receive a reception device when the file format (data format) of the image file to be transmitted is a data format that can be handled by the reception device indicated in the capability information. Is determined. In addition, when the data format of the image file to be transmitted is not a data format that can be handled by the receiving device, the control unit 201 determines that the receiving device cannot receive.

  If the data format of the transmission target data is a data format that can be handled by the receiving device, that is, if it is determined that the data can be received (Yes in S804), the control unit 201 advances the process to S808. If the data format of the transmission target data is a data format that cannot be handled by the receiving device, that is, if it is determined that reception is not possible (No in S804), the control unit 201 advances the processing to S805.

  In step S <b> 805, the control unit 201 displays a selection screen for accepting an instruction to continue or cancel the transmission of the image file on the display unit 204 and accepts an instruction input according to a user operation. When the control unit 201 receives an instruction to continue transmission (image reselection) (image reselection in step S805), the control unit 201 advances the process to step S806. When the control unit 201 receives an instruction to stop transmission (disconnect) (disconnect in step S805), the control unit 201 advances the process to step S810. In step S810, the control unit 201 performs processing for disconnecting communication with the mobile phone 120 serving as a receiving device, and ends the processing. That is, the control unit 201 performs control so as not to transmit data to be transmitted when it is determined that reception is impossible because the data format of the data to be transmitted is not a data format that can be handled by the receiving device.

  In step S806, the control unit 201 displays an image selection screen on the display unit 204, and reselects a transmission target image file in accordance with a user operation. At this time, when the data format of the selected image file is a data format other than the data format that can be handled by the receiving device, the control unit 201 cannot perform a transmission operation such as not being able to press the transmission button. You may do it. The process of S806 is an example of a change process for changing information to be transmitted.

  In step S807, if the data format of the image file to be transmitted after reselection is a data format that can be handled by the receiving device (Yes in step S807), the control unit 201 advances the processing to step S808. In step S808, the control unit 201 starts connection processing of a transfer service to the mobile phone 120 serving as a receiving device. Then, after the transfer service connection process to the mobile phone 120 is completed, in step S809, the control unit 201 transmits the image file to be transmitted to the receiving device. Above, the process of the camera 110 is complete | finished.

  As described above, the camera 110 as the communication apparatus according to the present embodiment receives information in a data format that can be handled by the receiving device as capability information before communication connection is completed, and data in a compatible data format. Can be sent.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 100 Communication system 110 Camera 120 Mobile phone 201 Control part 202 Storage part 203 Wireless part 204 Display part

Claims (11)

Receiving means for receiving capability information related to the receiving capability of the external device before completing the connection with the external device;
A determination means for determining whether or not the external device is capable of receiving information to be transmitted based on the capability information;
When the determination means determines that the external device cannot receive the information to be transmitted, changing means for changing the information to be transmitted;
A communication device comprising: transmission means for transmitting information after the change by the changing means.   The communication apparatus according to claim 1, further comprising a transmission unit configured to transmit the transmission target information when the determination unit determines that the external apparatus can receive the transmission target information. .   The communication apparatus according to claim 1, wherein the determination unit performs the determination before establishing communication with the external apparatus at an application layer.   The communication device according to claim 1, wherein the reception unit receives capability information related to a reception capability of the external device before belonging to the same network as the external device.   The communication device according to claim 1, wherein the determination unit performs the determination before belonging to the same network as the external device.   The communication device according to claim 4, further comprising a communication unit belonging to the same network as the external device when the determination unit determines that the external device can receive the information to be transmitted.   The communication apparatus according to claim 6, wherein the communication unit belongs to the same network as the external apparatus by a method based on Wi-Fi Direct.   The communication apparatus according to any one of claims 1 to 7, wherein the capability information is information related to a data amount that can be received by the external apparatus.   The communication apparatus according to claim 1, wherein the capability information is information relating to a data format that can be handled by the external apparatus. A communication control method executed by a communication device,
A reception step of receiving capability information related to the reception capability of the external device before completing the connection with the external device;
A determination step of determining whether or not the external device is capable of receiving information to be transmitted based on the capability information;
In the determination step, when it is determined that the external device cannot receive the information to be transmitted, a change step to change the information to be transmitted;
And a transmission step of transmitting information after the change in the change step.   The program for functioning a computer as each means of the communication apparatus of any one of Claims 1 thru | or 7.

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