A receiving device includes a plurality of digital input terminals, a signal receiving unit for receiving a video signal, and a switch unit for selectively connecting the plurality of digital input terminals to the signal receiving unit. The signal receiving unit is a receiving device that performs a mutual authentication with an external apparatus connected via a transmission channel to a digital input terminal selected by the switch unit, and receives a video signal from the external apparatus. The signal receiving unit includes a priority determining unit for cyclically determining a priority of the plurality of digital input terminals and a controller for controlling the switch unit so that a digital input terminal, which is determined by the priority determining unit as having a highest priority, is connected to the signal receiving unit.