Patent ID: 8391790

Claim:
A communication device, comprising: an antenna for proximity wireless communication to carry out contactless proximity wireless communication with an antenna of a counterpart instrument in proximity; a first wireless communication processing unit to carry out contactless proximity wireless communication using the antenna for proximity wireless communication; a second wireless communication processing unit to carry out wireless communication in a wireless communication format different from that of the first wireless communication processing unit; a ground potential to be disposed in a surrounding area of the antenna for proximity wireless communication and to be connected, when the counterpart instrument is in proximity, to a ground potential of the instrument; a detection unit to detect that the counterpart instrument to wirelessly communicate with the antenna for proximity wireless communication is connected in a condition allowing contactless proximity wireless communication; and a control unit to restrict wireless communication with the second wireless communication processing unit in a case that the detection unit detects connection and to remove the restriction after connected to the ground potential of the counterpart instrument with the ground potential during the restriction.