A display device of a multi-display system includes a display; a communicator configured to receive a divided image that is displayed on the display device, of a whole image that is displayed through a plurality of display devices included in the multi-display system; a storage configured to store the received divided image; and a processor configured to perform, when a reference image that is synchronized with the divided image is received, at least one among an operation for displaying the divided image that is stored in the storage on the basis of synchronization information that is extracted from the reference image and an operation for transmitting the reference image to another display device among the plurality display devices of the multi-display system.