INFORMATION PROCESSING SYSTEM

An information processing system includes: a first acquisition unit that acquires battery information on a battery of each of one or more vehicles; a second acquisition unit that acquires supply source information on a state of a power supply source; a selection unit that selects a vehicle for providing electric power for the power supply source as a power source out of the one or more vehicles, based on the supply source information and the battery information; and a request unit that requests the vehicle selected as the power source to provide the electric power.