A communication device comprising: a short-range radio communication unit configured for executing short-range radio communication with another device; a first processing unit configured for transmitting and receiving a message to and from the another device through the short-range radio communication executed by the short-range radio communication unit and having a first interface of a predetermined standard; a second processing unit having a second interface of a standard different from that of the first interface and configured for communicating with the first processing unit via the second interface; a reception unit configured for receiving a first message, which is a message to be transmitted to the second processing unit, from the first processing unit via the first interface and receiving a second message, which is a message to be transmitted to the first processing unit, from the second processing unit via the second interface; a conversion unit configured for converting a format of the first message received by the reception unit from a format of the first interface to a format of the second interface and converting a format of the second message received by the reception unit from the format of the second interface to the format of the first interface; and a transmission unit configured for transmitting the first message, of which the format is converted into the format of the second interface by the conversion unit, to the second processing unit via the second interface and transmitting the second message, of which the format is converted into the format of the first interface by the conversion unit, to the first processing unit via the first interface. a short-range radio communication unit configured for executing short-range radio communication with another device; a first processing unit configured for transmitting and receiving a message to and from the another device through the short-range radio communication executed by the short-range radio communication unit and having a first interface of a predetermined standard; a second processing unit having a second interface of a standard different from that of the first interface and configured for communicating with the first processing unit via the second interface; a reception unit configured for receiving a first message, which is a message to be transmitted to the second processing unit, from the first processing unit via the first interface and receiving a second message, which is a message to be transmitted to the first processing unit, from the second processing unit via the second interface; a conversion unit configured for converting a format of the first message received by the reception unit from a format of the first interface to a format of the second interface and converting a format of the second message received by the reception unit from the format of the second interface to the format of the first interface; and a transmission unit configured for transmitting the first message, of which the format is converted into the format of the second interface by the conversion unit, to the second processing unit via the second interface and transmitting the second message, of which the format is converted into the format of the first interface by the conversion unit, to the first processing unit via the first interface.