To effectively utilize a storage battery for domestic use charged with commercial power supplied from a power company as a power source for charging a vehicle such as an electric vehicle.

An in-vehicle storage battery 12 is charged with the power of a storage battery 8 for domestic use and system power from a bidirectional charger 7 by stopping charging from a power system of the storage battery 8 and the power supply from the storage battery 8 to an electric load 5 for domestic use when a vehicle 11 such as an electric vehicle is connected to a vehicle charger 26. According to such a scheme, the storage battery 8 for domestic use can be effectively utilized.