In this control method, a display screen representing a layout diagram of one floor containing at least two rooms is caused to be displayed at a display by the computer of an information terminal, apparatus icons representing each of at least one subject apparatus are displayed on the display screen representing the layout diagram, a specific subject apparatus of a type that stores the setting contents from the previous time the power was turned off is included among the at least one subject apparatus, the apparatus icon representing the specific subject apparatus is used shared among at least one room contained in the layout diagram, and when the selection of the apparatus icon representing the specific subject apparatus is detected and the selection of a region in a first room among the at least two rooms contained in the layout diagram is detected after the selection of the apparatus icon representing the specific subject apparatus has been detected, a first on/off control command for on/off control of the power to the specific subject apparatus corresponding to the first room for which the selection has been detected is output to a network.