A monitor apparatus includes: a display panel that displays a medical image; an as-viewed output terminal capable of outputting a video signal reflecting a same color set value as a color set value reflected in the medical image displayed on the display panel; a communication unit that detects device information regarding an external device connected to the as-viewed output terminal; and a second color setting reflection unit capable of controlling to further change the color set value reflected in the video signal outputted from the as-viewed output terminal based on a detection result of the communication unit.