To grasp power consumption for each user.

A personal power use calculation unit 106 calculates a total personal power use amount for each user in association with identification information acquired by in-section user information acquisition unit 103. The personal power use calculation unit 106 first calculates a value obtained by dividing a power use amount of a section for which a power use amount measurement unit 102 performs measurement by the number of total users existing in the section for each set unit time, for example every 30 minutes. The value is taken for a personal power use amount per the unit time for the user existing in the section, which is performed for each user and in each of the unit time set in a period when each user exists in the section. The personal power use calculation unit 106 next integrates personal power use amounts calculated for respective unit time within the time of existing in the section, for each user: and takes the integrated value for a total personal power use amount of each user.