US Patent 9622020 Communication device and communication method

A communication system includes a game machine and a headset. The headset detects a state change in the present device, the state change in the present device being caused by a predetermined action of a user, and transmits a signal indicating the state change in the present device to the game machine. The game machine receives, from at least one of one or more external devices, a signal indicating a state change in the external device. The game machine identifies a partner device in predetermined communication processing from among the one or more external devices on the basis of the received signal indicating the state change.