SYSTEM, METHOD, AND COMPUTER READABLE STORAGE MEDIUM

A system includes a management module which manages a plurality of vehicles by categorization into a plurality of groups based on combinations of deterioration levels and states of charge of a plurality of batteries included in the plurality of vehicles, and a selection module which selects, based on electric power supply/demand information in an electric power grid, a vehicle in which a battery is to be used for an electric power delivery. A method includes steps of acquiring information representing deterioration levels and states of charge of a plurality of batteries included in a plurality of vehicles, managing the plurality of vehicles by categorization into a plurality of groups based on combinations of the deterioration levels and the states of charge, and selecting, based on electric power supply/demand information in an electric power grid, a vehicle in which a battery is to be used for an electric power delivery.