A power management apparatus includes a communication unit (acquisition unit) that acquires information about supply and demand of electric power for a power bank (power storage device), and a processor (controller) that controls electric power received by an electric vehicle from the power bank. The processor sets a power exchange ratio of electric power received from the power bank to electric power supplied to the power bank, depending on the supply and demand of electric power. The processor determines an amount of electric power to be received by the electric vehicle from the power bank, based on an amount of electric power supplied from the electric vehicle to the power bank, and the power exchange ratio.