An image output system includes plural channels from each of which an image signal is output, a switching unit for switching the channel that outputs the image signal to an image output unit based on connection states of the plural channels, an information display generation unit for generating the image signal of an information display screen related to the currently outputting channel, and a display state storing unit for storing a display state related to the information display screen, the display state including a “display-ON” state and a “display-OFF” state. In a case where there is a change in the connection state of the currently outputting channel, when there is the information display screen whose display state is the “display-ON” state, the switching unit switches the channel after waiting for a predefined change in the display state related to the information display screen.