A plurality of charging cables are connected to a plurality of devices to be charged, respectively, and supply electric power. A plurality of relays correspond to the charging cables, respectively, and each of the relays switches on and off the supply of the electric power via the corresponding charging cable. A control unit turns on a relay connected to the charging cable, where a pilot signal generated by the device to be charged is detected, among the charging cables. The device to be charged is charged by the turned-on relay and the charging cable connected to the turned-on relay.
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