Communication apparatus and its method of operation

Communication device is switched to a standby state in which no power is supplied to and the main function unit power is supplied to the control unit from the power-on state and the power supply unit to which electric power is supplied to the control unit and the main functional part from the power supply unit . The main function unit performs a primary function operation based on video data and audio data. Communication unit receives configured to allow video data, audio data, and conversation request transmitted video data and audio data from possible and other communication terminals transmit to the other communication terminals. The control unit controls the main function unit, controls the communication of video data and audio data by the communication unit, when the communication apparatus is in the standby state, in response to a conversation request transmitted from another communication terminal run configured to allow incoming operation.