Communication device

A power control method for a communication device which comprises (i) a first receiver configured to receive an operation signal from a remote controller, (ii) a second receiver configured to receive a radio signal with a specific frequency, a power consumption of the second receiver being less than that of the first receiver, and (iii) a communication module capable of transmitting the operation signal to another communication device, the method comprising:

• controlling power supply to the first receiver and the communication module,
• wherein said controlling comprises:
• starting power supply to the first receiver if the second receiver receives the radio signal;
• starting power supply to the communication module if, after having started power supply to the first receiver, the first receiver receives the operation signal within a certain first period of time after the start of power supply to the first receiver;
• and
• starting power supply to the communication module if, after having started power supply to the first receiver, the first period elapses and the first receiver has not yet received the operation signal.

A communication device comprising:

• a first receiver configured to receive an operation signal from a remote controller;
• a second receiver configured to receive a radio signal with a specific frequency, a power consumption of the second receiver being less than that of the first receiver;
• a communication module capable of transmitting the operation signal to another communication device;
• a controller configured to control power supply to the first receiver and the communication module, and to start power supply to the first receiver and the communication module if the second receiver receives the radio signal;
• and
• a determination module configured to determine whether an operation target of the operation signal received by the first receiver is the communication device or not,
• wherein if the determination module determines that the operation target of the operation signal is the communication device, the communication module transmits a signal for notification that the operation target of the operation signal is the communication device, to the other communication device.