To perform efficient charging when a plurality of vehicles are charged at the same time by using a plurality of power supply sections.

The priority of charging stands X, Y and Z is set. The priority indicates that a charging stand having a higher priority has a higher electric energy supplied from the charging stand. The priority is set on the basis of electric energies supplied from the charging stands X, Y and Z to vehicles A-C, and battery capacities of storage batteries 13 respectively mounted on the vehicles A-C. Specifically, the priority is set from a ratio of a charged capacity to the battery capacity.