To conduct the optimum operation of an energy supply system, constituted by plural energy apparatus of many types to eliminate the disadvantages of prior art, and achieve cost saving, energy saving or low environmental load, in energy supply for a dwelling house or multiple dwelling houses.

The optimization control for the whole system is conducted according to the arithmetic result of one system controller. In the system controller, a calendar and a timer are incorporated, and two energy demand data bases, corrected according to the history of past energy demand and three system operation map data previously obtained by test evaluation and simulation, are stored. The three system operation map data are the summary of data on energy saving, low cost and reduction in exhaust emission, and the energy demand amount estimated according to the energy demand data base and the actual energy demand amount are compared to select the scheduled operation control and the load follow-up control, thereby performing the optimized operation of the system.