A second projector is configured to be able to connect with a first projector via a USB cable including a VBUS line. The second projector includes an image projecting unit that modulates light emitted from a light source and projects the light, a USB communication unit that detects, in a standby state, the supply of power via a VBUS from the first projector, and a control unit that performs control to switch an operating state of the second projector between the standby state and a normal operating state. When the supply of power of the VBUS is detected by the USB communication unit, the control unit activates the second projector from the standby state to the normal operating state.