An charge/discharge (C/D) scheduler includes a determination unit (160A) that determines a charge/discharge (C/D) schedule at an operating period for each of a plurality of batteries (140) based on a predetermined supply amount of electric energy for first particular periods, first predicted energy demand information for the first particular periods, and actual demand amount of electric energy for the operating period, the first particular periods including the operating period and being the predetermined number of time periods, so as to reduce at least either an imbalance energy or an imbalance cost in conjunction with SOC oscillation.
