A display system comprising: an image source device; and a plurality of display apparatuses (100, 100a, 100b) configured to receive content data from the image source device and display an image corresponding to the content data, wherein each of the plurality of display apparatuses comprises: a cabinet; a display panel provided on the cabinet; a door provided on the cabinet and configured to be opened and closed; a door open detector configured to detect opening of the door and output a door opening signal in response to detecting the opening of the door; an image data receiver configured to receive content data from the image source device a door open signal transmitter configured to receive the door open signal from the door open detector and transmit the door open signal to the image source device; and a display first controller configured to control the display panel to display a first image corresponding to the content data received from the image source device, wherein the image source device comprises: an image data transmitter configured to transmit the content data to the plurality of display apparatuses; a door open signal receiver configured to receive the door opening signal from the plurality of display apparatuses; and an image source controller configured to stop transmission of the content data to the plurality of display apparatuses in response to receiving of the door opening signal. an image source device; and a plurality of display apparatuses (100, 100a, 100b) configured to receive content data from the image source device and display an image corresponding to the content data, wherein each of the plurality of display apparatuses comprises: a cabinet; a display panel provided on the cabinet; a door provided on the cabinet and configured to be opened and closed; a door open detector configured to detect opening of the door and output a door opening signal in response to detecting the opening of the door; an image data receiver configured to receive content data from the image source device a door open signal transmitter configured to receive the door open signal from the door open detector and transmit the door open signal to the image source device; and a display first controller configured to control the display panel to display a first image corresponding to the content data received from the image source device, wherein the image source device comprises: an image data transmitter configured to transmit the content data to the plurality of display apparatuses; a door open signal receiver configured to receive the door opening signal from the plurality of display apparatuses; and an image source controller configured to stop transmission of the content data to the plurality of display apparatuses in response to receiving of the door opening signal. a cabinet; a display panel provided on the cabinet; a door provided on the cabinet and configured to be opened and closed; a door open detector configured to detect opening of the door and output a door opening signal in response to detecting the opening of the door; an image data receiver configured to receive content data from the image source device a door open signal transmitter configured to receive the door open signal from the door open detector and transmit the door open signal to the image source device; and a display first controller configured to control the display panel to display a first image corresponding to the content data received from the image source device, wherein the image source device comprises: an image data transmitter configured to transmit the content data to the plurality of display apparatuses; a door open signal receiver configured to receive the door opening signal from the plurality of display apparatuses; and an image source controller configured to stop transmission of the content data to the plurality of display apparatuses in response to receiving of the door opening signal. an image data transmitter configured to transmit the content data to the plurality of display apparatuses; a door open signal receiver configured to receive the door opening signal from the plurality of display apparatuses; and an image source controller configured to stop transmission of the content data to the plurality of display apparatuses in response to receiving of the door opening signal.