A display apparatus having a video call function, a control method for controlling the display apparatus, and a video call system that uses the display apparatus and control method are provided. The display apparatus includes: an external source connection unit to which an external source is connected; a camera connection unit to which a camera is connected; a network communication unit which enables network communication with other display apparatuses; and a controller which controls a codec processing unit to process a video signal from at least one of the camera and the external source and output the processed signal to the network communication unit during the video call. The display apparatus can share various information input from the camera, a microphone, and the external source with an opposite call party.