According to an embodiment, a power supply control system includes a state acquirer configured to acquire states of a plurality of fuel cell systems mounted in an electric device that operates using electric power, a power acquirer configured to acquire a required amount of electric power from the electric device, and a power generation controller configured to control power generation of one or more fuel cell systems among the plurality of fuel cell systems so that the required amount of electric power acquired by the power acquirer is satisfied on the basis of the state of each of the plurality of fuel cell systems acquired by the state acquirer.