To stop a maximum power demand in future from being overestimated. A storage device (1a) stores data of combinations of temperatures and power result values. An arithmetic device (1b) selects data equal to or higher than a predetermined temperature from the storage device (1a) and, when the power result values corresponding to the temperatures of the selected data are smaller than a power calculation value calculated from a regression formula derived from the data of the combinations and the temperatures of the selected data, calculates, based on the temperatures equal to or higher than the predetermined temperature and the regression formula, a maximum power demand value.
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