1. A received energy reduction information calculation apparatus comprising: a transceiver and receiving unit configured to communicate with a controller; and circuitry configured to: predict a prediction amount of at least one of energy supply and energy consumption in a future prescribed time period with respect to at least one control target equipment, which each acts as either one of an energy-supplying equipment and an energy-consuming equipment, set a plurality of incentive unit prices in association with a demand response; calculate, for each of the plurality of incentive unit prices, based on the prediction amount and an energy fee reflected from each of the plurality of incentive unit prices, at least one operation schedule of the at least one control target equipment for the demand response, calculate a reduction amount of a received energy in accordance with the at least one operation schedule, and modify an operating schedule of the at least one control target equipment for a set period of time, based on the calculated reduction amount.