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1. A cordless communication system comprising:
a base unit that is configured to be connected to a communication network, the base unit comprising:
a first base unit wireless communicating unit that is configured to implement wireless and bidirectional communications;a base unit communicating unit configured to transmit a handset halt signal; anda first power line configured to be connected to a commercial power network; a handset comprising:
a first handset wireless communicating unit that is configured to communicate bidirectionally and wirelessly with the first base unit wireless communicating unit;a second handset wireless communicating unit that is provided independent of the first handset wireless communicating unit and is configured to implement wireless and bidirectional communications;a handset switching unit that is configured to switch between a handset normal mode in which power is supplied to both the first handset wireless communicating unit and the second handset wireless communicating unit and a handset power-saving mode in which power to the first handset wireless communicating unit is interrupted and power is supplied to the second handset wireless communicating unit; anda handset starting unit that is configured to control the handset switching unit to supply power to the first handset wireless communicating unit in order to switch to the handset normal mode from the handset power-saving mode if the second handset wireless communicating unit receives a handset start signal instructing the handset to cancel the handset power-saving mode during the handset power-saving mode; a charging base provided independently of the base unit, the charging base comprising:
a second power line configured to be connected to the commercial power network;a charging base wireless communicating unit that is configured to wirelessly and bidirectionally communicate with the second handset wireless communicating unit;a charging unit that is capable of supplying power to the handset for charging the handset when the handset is mounted on the charging base; anda relaying unit that is configured to exchange signals with the base unit communicating unit and the charging base wireless communicating unit in order to relay signals between the base unit communicating unit and the second handset wireless communicating unit, the relaying unit communicating with the base unit communicating unit via the first power line, the second power line, and the commercial power network, wherein the base unit communicating unit is configured to transmit the handset halt signal to the relaying unit via the first power line, the second power line, and the commercial power network, wherein if the relaying unit receives the handset halt signal from the base unit communicating unit via the first power line, the second power line, and the commercial power network, the relaying unit controls the charging base wireless communicating unit to transmit the handset halt signal to the second handset wireless communicating unit, and wherein the handset switching unit switches from the handset normal mode to the handset power-saving mode if the second handset wireless communicating unit receives the handset halt signal transmitted from the charging base wireless communicating unit.
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