An image processing apparatus, according to one embodiment of the present invention, comprises: a receiver for receiving a first image and a second image; a first processor for outputting a third image by using at least one of the first image and the second image; a signal line bypassing at least one of the first image and the second image; a switch for connecting a signal output from the receiver to the first processor or the signal line; and a transmitter for transmitting at least two of the first to third images.