In an image processing apparatus, a power switcher starts supplying power in a second mode in which the power is supplied to a controller but not supplied to an image processor, when a state in which the power switcher receives no power is changed to a state in which the power switcher receives power. When a state in which no power is supplied to the controller is switched to a state in which power is supplied to the controller in the second mode and when the power switcher is receiving no power from a commercial power source, the controller, based on particular information, switches, before a first processing, a power supply mode from the second mode to a first mode in which no power is supplied or switches the power supply mode from the second mode to the first mode after the first processing.