To increase the total charge/discharge amount of a battery while satisfying a constraint condition regarding the charge/discharge of the battery, which is determined according to a charge/discharge environment of the battery.SOLUTION: A constraint condition setting unit 30 sets a constraint condition regarding the charge/discharge of a battery 12 according to a current charge/discharge environment of the battery 12. A charge/discharge condition setting unit 32 charges/discharges the battery 12 under a charge/discharge condition in which the total charge/discharge amount of the battery 12 is larger than the other charge/discharge conditions (when charging/discharging is continued under the charge/discharge condition) from among the plurality of charge/discharge conditions that satisfy the constraint conditions set by the constraint condition setting unit 30 on the basis of total charge/discharge amount information 22 indicating the total charge/discharge amount when the charge/discharge of the battery 12 is continued under the charge/discharge condition for each charge/discharge condition of the battery 12.SELECTED DRAWING: Figure 1