In this control method, an operation icon for displaying an operation screen for an electric shutter device is caused to be displayed by the computer of an information terminal on a display screen of the information terminal; when the selection of the operation icon is detected, the operation screen for the electric shutter device is displayed; the operation screen includes a shutter image representing the shutter of the electric shutter device; and when a pinch-out operation is detected on the operation screen, a first opening control command for opening the shutter of the electric shutter device is output to a network.