POWER MANAGEMENT APPARATUS AND POWER MANAGEMENT METHOD

In a server (30), an acquisition unit (32) obtains, from a vehicle (50) through a communication apparatus (31), history information indicating that demand and supply of electric power has been performed for a power grid (PG), and information on the state of charge of a battery (130). A control unit (33) determines priorities of a plurality of distributed energy resources for a demand response request. The control unit (33) determines a priority of the vehicle (50) so that the vehicle (50) is less likely to be selected for the DR request, when the state of charge obtained by the acquisition unit (32) has changed although the acquisition unit (32) has not received the history information.