JP5328843B2 - COMMUNICATION DEVICE AND ITS CONTROL METHOD - Google Patents

Description

  The present invention relates to a technique for setting communication parameter information.

  There has been proposed a method for automatically setting wireless communication parameters such as a network identifier (SSID), encryption method, encryption key, authentication method, and authentication key, which is said to be complicated for the user. For example, for wireless LAN automatic setting, a method to safely and automatically transfer the wireless parameter settings of the access point (repeater) and station (terminal) from the access point to the station with a simple operation is also realized as a product. Has been.

  In addition, when performing wireless communication, products that are expected to be used in various forms of use, such as communicating directly with a specific partner or communicating with an unspecified partner without using an access point. Has also been realized.

  Further, since the wireless parameter setting includes security information on the network, a detailed method for performing secure data communication has been proposed. For example, it is determined whether or not data transmission is permitted from the attribute value added to the data and the access policy. Patent Document 1 describes a safe data storage operation, such as determining whether or not data can be stored from the network attribute value and the policy even when receiving data, and storing the received data if possible. .

  Proposals have also been made for the need to control information to be distributed for each user or according to the place of use. A management device with configuration information (profile) that can be used for multiple networks provides information to the terminal according to the user of the terminal and the location where it is used, and the user uses the setting information without being aware of the network. The operation for making a desired connection is described in Patent Document 2.

JP 2003-051857 A JP 2005-020112 A

  As described above, it is possible to perform control such as safe data storage on the network managed by the above-described management apparatus and switching of communication parameter setting information for each user. However, as the need for communication in unmanaged networks such as ad hoc networks increases in the future, the usage pattern will become more complicated, for example, communication parameters in multiple operation modes such as between specified wireless communication devices and between unspecified wireless communication devices. Configuration information needs to be exchanged. In that case, the user wants to permanently store or temporarily control the communication parameter setting information from the security aspect according to the operation mode, but the current situation is left to manual control at the user's will. The operation was complicated. In addition, forgetting to delete temporary communication parameter setting information and continuing to use it as it is, there were problems in terms of security and operation.

An object of the present invention is to perform security control without forcing a complicated operation.

The present invention is a communication device comprising:
Setting means for storing in a storage means a communication parameter shared between the communication apparatus and another communication apparatus;
Selection means for selecting either a first operation mode for setting communication parameters between two devices or a second operation mode for setting communication parameters between at least three devices; ,
Clearing means for clearing the communication parameter stored in the storage means by the setting means in the second operation mode when the communication session is terminated;
It is characterized by having.

According to the present invention , the set communication parameters can be cleared without forcing a complicated operation. Therefore, for example, since communication parameters when a temporary network is constructed between a plurality of devices are automatically cleared, security can be ensured.

It is a figure which shows an example of a structure of the radio | wireless communications system in 1st Embodiment. It is a schematic block diagram which shows an example of a structure of the apparatus A (digital camera 100). 2 is a schematic block diagram illustrating an example of a configuration of a device B (printer 101). FIG. It is a figure which shows an example of a structure of the setting information area of the operation mode and communication parameter in 1st Embodiment. It is a flowchart which shows the process which receives communication parameter setting information when an operation mode is an auto mode. It is a flowchart which shows the process preserve | saved in a temporary area, when there is no empty in an AUTO mode communication parameter setting information area. It is a flowchart which shows the process which performs communication parameter setting exchange when an operation mode is party mode. It is a flowchart which shows the process which implement | achieves temporary property in synchronization with power supply control. It is a flowchart which shows the process which implement | achieves temporaryity at the time of expiration of a timer (timed expression). It is a flowchart which shows the process which performs wireless connection using communication parameter setting information, and implement | achieves a temporary property after apparatus execution. It is a flowchart which shows the process which implement | achieves temporaryity by exchanging and holding communication parameter setting information in party mode again. It is a flowchart which shows the process which implement | achieves the temporary property of communication parameter setting information by switching of an operation mode. It is a figure which shows the strength level of the security which each apparatus has. It is a flowchart which shows the process which determines the strength level of security according to whether an operation mode is an auto mode or a party mode. It is a flowchart which shows the process which determines the intensity | strength level of security according to charging information.

  Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating an example of a configuration of a wireless communication system according to the first embodiment. As shown in FIG. 1, the device A is a digital camera 100, has a wireless LAN in the wireless communication function 105, and configures a network in a communication parameter setting mode by pressing a communication parameter setting start button 103. The device B is the printer 101, has a wireless LAN in the wireless communication function 106, and configures a network in the communication parameter setting mode by pressing the communication parameter setting start button 104. The device C is the digital camera 102, has a wireless LAN in the wireless communication function 108, and configures a network in the communication parameter setting mode by pressing the communication parameter setting start button 107.

  The operation mode and setting method of the communication parameter setting mode in the first embodiment will be further described later.

  Next, the configuration of the wireless communication devices A and B will be described with reference to FIGS. The device C is the same as the device A, and the description thereof is omitted.

  FIG. 2 is a schematic block diagram illustrating an example of the configuration of the device A (digital camera 100). In FIG. 2, 201 is a control unit that controls the digital camera 100, 202 is an image processing unit, 203 is a ROM that stores control commands (programs) and control data, and 204 is a RAM. The RAM 204 stores setting communication parameters for forming a communication parameter setting network in advance. A wireless communication processing unit 205 performs communication control in the wireless LAN. Reference numeral 206 denotes an antenna, and 207 denotes an antenna control unit.

  Reference numeral 208 denotes an imaging unit that captures a pixel signal input from the CCD 209. Reference numeral 210 denotes a card interface that controls a recording media card that stores captured images and setting information, and 211 denotes a display unit. An operation unit 212 includes buttons for instructing photographing, reproduction, setting, and the like. Reference numeral 213 denotes a power supply unit including a secondary battery. Reference numeral 214 denotes a communication interface unit other than wireless, for example, a wired interface such as USB or IEEE1394. Reference numeral 215 denotes a communication parameter setting start button for starting communication parameter setting. An EEPROM 216 stores communication parameters.

  FIG. 3 is a schematic block diagram illustrating an example of the configuration of the device B (printer 101). In FIG. 3, reference numeral 301 denotes a control unit that controls the printer 101, 302 denotes an image processing unit, 303 denotes a ROM that stores control commands (programs) and control data, 304 denotes a RAM, and 305 denotes a power source unit. The RAM 304 stores in advance communication parameters for setting for forming a communication parameter setting network. Reference numeral 306 denotes a communication interface unit other than wireless, for example, a wired interface such as USB or IEEE1394.

  Reference numeral 307 denotes a paper feed / discharge unit that feeds and discharges printer paper. A printer engine 308 performs print control such as an electrophotographic system or an inkjet system. Reference numeral 309 denotes a card interface that controls a recording media card in which an image is stored, and 310 denotes a display unit. Reference numeral 311 denotes an operation unit, which includes buttons such as menus and settings. A wireless communication processing unit 312 performs communication control in the wireless LAN. Reference numeral 313 denotes an antenna, and 314 denotes an antenna control unit. Reference numeral 315 denotes a communication parameter setting start button, which performs communication parameter setting start. Reference numeral 316 denotes an EEPROM that stores communication parameters.

  Next, communication parameters set in the communication parameter setting process according to the operation mode provided for each device will be described with reference to FIG. Here, the operation mode includes an auto mode in which communication parameter setting information is automatically set between two devices and a party mode in which communication parameter setting information is automatically set between three or more devices.

  FIG. 4 is a diagram illustrating an example of a configuration of an operation mode and communication parameter setting information area according to the first embodiment. The communication parameters are stored in the EEPROM 216 in the case of the digital cameras 100 and 102, and are stored in the EEPROM 316 in the case of the printer 101.

  As shown in FIG. 4, when the operation mode is the auto mode, the communication parameter is stored in the AUTO mode communication parameter setting information area as a permanent communication parameter. In this example, permanent communication parameters 1 and 2 are already stored in areas 401 and 402 of the AUTO mode communication parameter setting information area.

  When the operation mode is the party mode, the communication parameter is stored in the party mode communication parameter setting information area as a temporary communication parameter. In this example, temporary communication parameters are stored in area 404 of the party mode communication parameter setting information area. The communication parameters stored in the AUTO mode communication parameter setting information area can be deleted by a user operation, but are not deleted unless there is a user operation.

  The above-described area holds information such as SSID, mode, authentication, encryption, encryption key, index, channel, device type, IP address setting, management terminal MCA address, and pointer. Here, the SSID is a network identifier necessary for wireless LAN connection. The mode is information indicating an infrastructure mode or an ad hoc mode. Authentication is information indicating an authentication type. The encryption is information indicating the type of encryption key. The index is a key index. A channel is information representing a communication frequency. The device type is information indicating the type of the counterpart device. The IP address setting is information indicating the type of IP address. The management terminal MAC address is the MAC address of the counterpart terminal. The pointer is a link to the next area, and a null code 403 is stored at the end of the link.

  In the above configuration, processing in which the digital cameras 100 and 102 set the auto mode as the operation mode and the digital camera 100 receives the communication parameter setting information from the digital camera 102 will be described.

  FIG. 5 is a flowchart showing processing for receiving communication parameter setting information when the operation mode is the auto mode. First, the user presses the communication parameter setting start button 103 of the digital camera 100 to set the operation mode to the auto mode (S501), and at the same time, the communication parameter setting exchange is started (S502). Next, the process waits until communication parameter setting information is received from the digital camera 102 (S503). When the communication parameter setting information is received, the current operation mode is the auto mode. Therefore, when storing the communication parameter setting information, it is checked whether or not the AUTO mode communication parameter setting information area is empty ( S504).

  If the area 403 of the AUTO mode communication parameter setting information area shown in FIG. 4 is empty, the received communication parameter setting information is stored in the area 403 as the permanent communication parameter 3 (S505). Then, the fact that the communication parameter setting information has been successfully exchanged is displayed on the display unit 211 (S506), and this process is terminated.

  If there is no space in the AUTO mode communication parameter setting information area, the communication parameter setting exchange has failed, and the fact that there is no space in the area is displayed on the display unit 211 (S507), and this processing is terminated. . Here, when there is no space in the area, it may be stored in the temporary area.

  FIG. 6 is a flowchart showing a process of saving in the temporary area when there is no space in the AUTO mode communication parameter setting information area. Steps S601 to S606 shown in FIG. 6 are the same as steps S501 to S506 shown in FIG. 5, and the processing after step S607 will be described here.

  In step S604, if there is no space in the AUTO mode communication parameter setting information area, a notification to the effect that the remote device is stored in the temporary area is sent (S607), and the communication parameter is stored in the temporary area (S608). This process ends.

  As a result, even when the operation mode is the auto mode, it is possible to continue communication without causing an error even if the area becomes insufficient by using the temporary area.

  Next, a case where the party mode is set as the operation mode and the communication parameter setting is exchanged among the digital camera 100, the printer 101, and the digital camera 102 will be described. Here, a case where the digital camera 100 receives communication parameter setting information from the printer 101 will be described with reference to FIG.

  FIG. 7 is a flowchart showing processing for exchanging communication parameter settings when the operation mode is the party mode. First, the user presses the communication parameter setting start button 103 of the digital camera 100 to set the operation mode to the party mode (S701), and at the same time, the communication parameter setting exchange is started (S702). Next, the process waits until communication parameter setting information is received from the printer 101 (S703). When the communication parameter setting information is received, since it is currently operating in the party mode as the operation mode, it is checked whether or not the party mode communication parameter setting information area is empty when storing the communication parameters (S704).

  If the party mode communication parameter setting information area shown in FIG. 4 is empty, the received communication parameter setting information is stored in the area 404 as a temporary communication parameter (S705). Then, the fact that the communication parameter setting information has been successfully exchanged is displayed on the display unit 211 (S706), and this process is terminated.

  If the party mode communication parameter setting information area has already been used, the communication parameter setting exchange has failed, and the display unit 211 displays that the area to be saved is not available as a reason (S707). The process ends.

  Next, a plurality of methods for automatically realizing the temporaryness of the communication parameter setting information held in the area 404 in the party mode will be described.

  As a first method, a case where communication parameter setting information held as a temporary communication parameter of the digital camera 100 is cleared in synchronization with power control will be described.

  FIG. 8 is a flowchart showing a process for realizing temporality in synchronization with power control. First, it is checked whether or not the power is turned off in the digital camera 100 (S800). If the power is turned off, it is checked whether communication parameter setting information is stored in the area 404 (S801). If it is stored, the information stored in the area 404 is completely cleared (S802).

  In this way, temporaryity is realized by turning off the power. Although only power-off has been described here, the same effect can be obtained even if the area 404 is cleared when the power is on.

  Next, as a second method, a case will be described in which communication parameter setting information held as a temporary communication parameter of the digital camera 100 is cleared after a predetermined time has elapsed.

  FIG. 9 is a flowchart showing a process for realizing the temporaryity at the time of expiration of the timer (timed expression). First, in the digital camera 100, it is checked whether or not the exchange of communication parameter setting information is completed (S900). After the exchange is completed, the communication parameter setting information is stored in the area 404 (S901). At the same time, the temporary area storage monitoring timer T1 is started (S902). Then, it waits for the timer T1 to expire (S903). When the timer T1 expires, the communication parameter setting information stored in the area 404 is cleared (S904).

  Next, as a third method, a case where the communication parameter setting information held as the temporary communication parameter of the digital camera 100 is cleared after the communication service is completed will be described.

  FIG. 10 is a flowchart illustrating a process for realizing a temporary property by performing a wireless connection using communication parameter setting information and performing a service between devices. First, in the digital camera 100, it is checked whether or not the exchange of communication parameter setting information is completed (S1000), and after the exchange is completed, the communication parameter setting information is stored in the area 404 (S1001). Next, communication is started based on the communication parameters stored in the area 404 (S1002). Thereafter, the communication service is started with the other party whose communication parameters have been exchanged (S1003), and the communication service is executed (S1004). Then, it waits for the completion of the communication service (S1005). When the service is completed, the communication parameter setting information stored in the area 404 is cleared (S1006).

  Thus, for example, in the case of communication parameter setting information that also serves as a one-time service ticket, once the service is executed, the communication parameter setting information is deleted, the next communication cannot be performed, and the service cannot be started. Can be realized.

  Next, as a fourth method, a case will be described in which communication parameter setting information held as a temporary communication parameter of the digital camera 100 is cleared when new communication parameter setting information is stored.

  FIG. 11 is a flowchart showing a process for realizing temporaryity by exchanging and holding communication parameter setting information again in the party mode. First, in the digital camera 100, it is checked whether or not the exchange of communication parameter setting information is completed (S1100). After the exchange is completed, the communication parameter setting information is stored in the area 404 (S1101). Next, communication is started based on the communication parameters stored in the area 404, and the communication service is executed with the partner whose parameters have been exchanged (S1102). When the party mode is designated as the operation mode after the service ends (S1103), the communication parameter setting information is exchanged again. After the exchange is completed (S1104), the area 404 is cleared (S1105). Then, the received new communication parameter setting information is stored in the area 404 (S1106).

  Thereby, it is possible to easily communicate with the communication partner that has once exchanged parameters in the party mode any number of times until the next party mode is executed.

  Next, the case where the printer 101 exchanges the communication parameter setting information in the party mode during the communication after exchanging the communication parameter setting information in the auto mode will be described.

  FIG. 12 is a flowchart showing processing for realizing the temporaryness of the communication parameter setting information by switching the operation mode. First, when the printer 101 is communicating with the communication parameter setting information stored in the permanent communication parameter area (S1200), the communication parameter setting start button 104 is pressed. When the party mode is set as the operation mode (S1201), permanent communication parameters used in normal communication are temporarily saved (S1202). At the same time, exchange of communication parameter setting information is started in the party mode (S1203), and the exchange is completed (S1204).

  Thereafter, when the exchange is completed, the communication parameter setting information of the party mode is stored in the temporary area (S1205), and communication is started with the communication parameter (S1206). Then, a communication service is executed with the other party whose parameters have been exchanged (S1207). After the service ends (S1208), the permanent communication parameters that have been temporarily saved are reset (S1209). Then, the communication parameter setting information stored in the temporary area is cleared (S1210), and the operation is resumed with the communication parameters in the permanent area (S1211).

  As a result, even if a temporary user appears during normal use of a fixed network at home like a printer, the settings are automatically returned to the fixed network again. be able to. On the other hand, a user who wants to use the printer temporarily can exchange communication parameter setting information in the party mode and execute the service.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described in detail with reference to the drawings. In the second embodiment, a case will be described in which the security strength level included in the communication parameter setting information in the operation mode is controlled.

  FIG. 13 is a diagram showing the security strength level of each device. As the strength of security shown in FIG. 13, the strength decreases in the order of security 1> security 2> security 3> security 4> security 5. In the example shown in FIG. 13, the device A has security levels 1, 2, 3, and 5 as the security strength level, the device B has security levels 1, 3, and 5, and the device C has security levels 1, 2, 4, and 5. have. Of the security levels shared by the devices, the strongest security level is security 1 and the lowest security level is security 5.

  In the following, a detailed description will be given of how to ensure security by switching control of the security strength according to the operation mode, improve safety, and achieve mutual compatibility between a plurality of devices.

  First, when exchanging communication parameter setting information, a case will be described in which the security strength level is selected according to the operation mode, the security is set in the communication parameter setting information, and exchange is performed.

  FIG. 14 is a flowchart showing processing for determining the security strength level according to whether the operation mode is the auto mode or the party mode. First, exchange of communication parameter setting information is started in the digital camera 100 (S1401). The security strength is exchanged with each device (S1402), and it is checked whether the security strength of all devices currently on the same network has been collected (S1403). Next, when the operation mode is the party mode (YES in S1404), the collected security strengths are compared (S1405). Here, the minimum and common security is selected, and the security is set in the communication parameter setting information (S1406). In this case, according to FIG. The communication parameter setting information is exchanged with each device (S1409).

  When the operation mode is the auto mode, the security strengths are compared (S1407). As a result of the comparison, the strongest common security is selected, and the security is set in the communication parameter setting information (S1408). The communication parameter setting information is exchanged with each device (S1409).

  As a result, since information is persistent in auto mode, high security is selected as the level of security, and in party mode, an unspecified number of people participate and parameters are temporary, so everyone can communicate. Select a security level. This makes it possible to achieve both compatibility and security in accordance with the usage mode.

  Next, a description will be given of a process for determining a security level when it is desired to increase the security level because the accounting information is included in the communication parameter setting information even in the party mode as the operation mode. In addition, although accounting information is taken as an example, other highly confidential information may be used.

  FIG. 15 is a flowchart showing processing for determining the security strength level according to the billing information. First, exchange of communication parameter setting information is started in the digital camera 100 (S1501). The security strength is exchanged with each device (S1502), and it is checked whether the security strength of all devices currently on the same network has been collected (S1503). Next, it is checked whether the billing information is included in the communication parameter setting information (S1504). If the accounting information is included (YES in S1504), the collected security strengths are compared (S1505). Here, the highest security that everyone can communicate with is selected and set in the communication parameter setting information (S1506). Then, the communication parameter setting information at a higher level is exchanged (S1509).

  If the accounting information is not included, the security strength for each operation mode is set as in the process shown in FIG. 14 (S1507), and the security corresponding to the operation mode is set in the communication parameter setting information (S1508). Then, the communication parameter setting information is exchanged with each device (S1509).

  Thereby, even in the party mode, when communicating highly confidential information, the security level can be increased.

  In addition, when the operation mode is auto mode, high security strength is required, but higher security can be realized by adding processing such as rejecting communication with terminals that do not exceed a certain security level. It becomes possible.

[Other Embodiments]
As another embodiment, by allowing the user to select a plurality of temporary parameter holding methods in the party mode, it is possible to realize temporality according to time.

  In addition, although a digital camera and a printer have been described as examples as devices, the present invention is not limited thereto, and can be applied to a notebook personal computer (PC) having a wireless communication function, a portable terminal, and the like.

  Even if the present invention is applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), it is applied to an apparatus (for example, a copier, a facsimile machine, etc.) composed of a single device. It may be applied.

  In addition, a recording medium in which a program code of software for realizing the functions of the above-described embodiments is recorded is supplied to the system or apparatus, and the computer (CPU or MPU) of the system or apparatus stores the program code stored in the recording medium. Read and execute. It goes without saying that the object of the present invention can also be achieved by this.

  In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiment, and the recording medium storing the program code constitutes the present invention.

  As a recording medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  In addition, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also the following cases are included. That is, based on the instruction of the program code, an OS (operating system) running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing. .

  Further, the program code read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. After that, based on the instruction of the program code, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing, and the function of the above-described embodiment is realized by the processing. Needless to say.

Claims (21)

A communication device,
Setting means for storing in a storage means a communication parameter shared between the communication apparatus and another communication apparatus;
Selection means for selecting either a first operation mode for setting communication parameters between two devices or a second operation mode for setting communication parameters between at least three devices; ,
Clearing means for clearing the communication parameter stored in the storage means by the setting means in the second operation mode when the communication session is terminated;
A communication apparatus comprising:   The communication apparatus according to claim 1, wherein the communication session is terminated upon completion of a communication service.   The communication apparatus according to claim 1, wherein the communication session ends in response to an instruction to turn off the power of the communication apparatus.   The communication apparatus according to claim 1, wherein the communication session is terminated by expiration of a predetermined time.   The communication apparatus according to claim 1, wherein the communication session is terminated when a new communication parameter is stored by the setting unit.   The communication apparatus according to claim 1, wherein the clear unit clears the communication parameter from the storage unit.   The communication device according to claim 1, wherein the clearing unit clears the communication parameter stored in the storage unit by overwriting the communication parameter with a different communication parameter. Detecting means for detecting an instruction to start setting communication parameters by the setting means;
The communication according to any one of claims 1 to 7, further comprising: a forming unit that forms a network for setting communication parameters with another communication device in response to detection by the detecting unit. apparatus. It said selection means in accordance with by the selected communication device according to any one of claims 1 to 8 communication parameters the set, characterized by further comprising a management means for managing a different management methods. The setting means, the communication device according to any one of claims 1 to 9, wherein the storing the communication parameters for storing in said second operation mode as a temporary communications parameters. Communication apparatus according to any one of claims 1 to 1 0, characterized in that varying the strength of security of the communication parameters in accordance with the operation mode selected by said selection means. Communication parameters stored by the setting means in a first mode of operation to set the communication parameters between two devices, one of claims 1 to 1 1, characterized in that it is cleared in response to a user instruction Item 1. The communication device according to item 1. By the clear means, communication parameter a communication session is cleared when completed, claims 1 to 1 2, characterized in that it is stored in a different storage area from the communication parameters that are not cleared when the communication session is terminated The communication device according to any one of the above. The communication parameters, encryption method, encryption key, authentication method, a communication apparatus according to any one of claims 1 to 1 3, characterized in that at least one of the authentication key. The communication parameters, the communication device according to any one of claims 1 to 1 4, characterized in that it comprises a network identifier.   The communication device according to claim 1, wherein the communication parameter is a parameter for forming a wireless LAN. It further has an exchange means for exchanging information about security with other communication devices,
The communication apparatus according to any one of claims 1 to 16, wherein a communication parameter is set based on information regarding security exchanged. The clear means, communication apparatus according to any one of claims 1 to 1 7, characterized in that to clear communication parameters used for the communication session. A control method for a communication device having a storage means for storing communication parameters set in the communication device,
A storage step in which the setting means stores in the storage means a communication parameter shared between the communication apparatus and another communication apparatus;
The selection means selects either the first operation mode for setting communication parameters between two devices or the second operation mode for setting communication parameters between at least three devices. A selection process to
A clearing step of clearing communication parameters stored in the storage unit in the second operation mode when the clearing session is terminated;
A method for controlling a communication apparatus, comprising: The program for functioning a computer as each means of the communication apparatus of any one of Claims 1 thru | or 18 . A program for a communication device that stores, in a storage means, communication parameters shared with other communication devices,
A selection step of selecting either a first operation mode for setting communication parameters between two devices or a second operation mode for setting communication parameters between at least three or more devices; ,
A program for causing the communication device to execute a clearing step of clearing the communication parameter stored in the storage unit in the second operation mode when the communication session is ended.

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