A supply and demand adjustment system, that utilizes characteristics of a supply-and-demand adjustment apparatuses and precisely matches the total supply-and-demand adjustment amount with a required adjustment amount, when adjusting supply and demand, is provided. The supply and demand adjustment system that includes a central control apparatus and one or more supply-and-demand adjustment apparatuses, the central control apparatus including, supply-and-demand-adjustment-apparatus-state-collection unit that collects information with regard to a state of each supply-and-demand adjustment apparatus, allocation band calculation unit that calculates a frequency band and an intensity of a fluctuation of supply and demand adjustment to be allocated to the supply-and-demand adjustment apparatus based on the information of the state, and a supply-and-demand-adjustment-amount-calculation-unit that calculates a supply-and-demand adjustment amount for each supply-and-demand adjustment apparatus based on the frequency band and the intensity of the fluctuation of supply and demand adjustment to be allocated to the supply-and-demand adjustment apparatus.