Patent ID: 8478914

Claim:
A display apparatus, comprising: a first signal receiving unit that receives a first signal from an external device via a bidirectional first transmission path through a plurality of channels by means of a differential signal; a communication unit that performs communication with the external device via two pairs of differential transmission paths contained in the first transmission path and receives a notification of a connection state from the external device by means of at least one DC bias potential of the two pairs of differential transmission paths; an image display unit that displays images by processing a video signal received by the first signal receiving unit; a second signal receiving unit that receives a second signal of a same video source as the first signal via the first transmission path, the second signal being received by the second signal receiving unit via the first transmission path based on whether recording is instructed by a user; a signal transmitting unit that transmits a signal corresponding to the second signal received by the second signal receiving unit to another external device different from the external device; and wherein the two pairs of differential transmission paths are a reserved line and a Hot Plug Detect (HPD) line constituting a High Definition Multimedia Interface (HDMI) cable.