To provide a system for supporting and promoting energy saving without forcing employees to move their sheets in a free address office environment.

In a system for controlling energy saving by, when a plurality of environment controlling apparatuses such as illumination or air conditioning equipment are arranged in a living room, controlling the operating state for each environment control apparatus in accordance with the use situations of seats in the living room, a seat instruction part 15 allocates a seat to be used by each employee under the consideration of the influence range (first seat range) of each environment control apparatus stored in an influence seat DB13 on the basis of the daily schedule of the employee registered in a schedule DB11. The seat instruction part 15 classifies employees into absent time zone-categorized groups, and associates the employees with any of first seat range groups each of which consists of one or more first seat ranges for each of the classified groups. An equipment management part 16 controls the stop of the operation of the environment control equipment group corresponding to the first seat range group in the absent time zone.