A first trading price of power in a first time period obtained by dividing a day into predetermined time periods and a second time different from the first time period obtained by dividing the day into predetermined time periods A determination device that makes a determination on economics due to charging / discharging of the storage battery based on a second selling price of the power of the belt and a charge / discharge efficiency of the storage battery, and a determination result of the determination device based on the determination result of the determination device And a determination device for determining a charging / discharging plan of the storage battery in the second time zone.
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