ELECTRIC POWER DEMAND/SUPPLY MANAGEMENT DEVICE

An electric power demand/supply management device includes: a state information acquisition unit that obtains state information indicating the current state of a battery which is mounted on, for example, a vehicle; a performance calculation unit that calculates a performance index indicating the consumption degree of the battery from the state information; and an incentive imparting unit that imparts an incentive according to a value of the performance index to a provider who provides the battery as electric power demand/supply adjustment means of an electric power transmission/distribution system.