Patent ID: 7346329

Claim:
A communication system communicating between a first communication terminal and a second communication terminal in accordance with a predetermined wireless communication standard, wherein the first communication terminal comprises: a switch switching on or off a power supply of the first communication terminal; and message transmission means for transmitting a predetermined first message or second message to the second communication terminal corresponding to an on/off operation of the switch, the second communication terminal comprises: communication means for communicating with the first communication terminal in accordance with the predetermined wireless communication standard; first power supply control means switching off a main power supply of the second communication terminal at reception of the first message; second power supply control means for switching on the main power supply of the second communication terminal at reception of the second message; mode setting means for setting the communication means in a receive only mode at reception of the first message, or setting the communication means in a mode capable of transmitting and receiving at reception of the second message; and sub-power supply providing means for providing a sub power supply as a driving power supply to the second power supply control means during a period where the main power supply of the second communication terminal is off.