A control method of a display device includes receiving identification (ID) information of an electronic devices connected to the display device; determining whether a remote controller includes a control setting for the electronic device based on the received ID information, wherein the remote controller controls a plurality of electronic devices associated with the display device; obtaining a control key of the remote controller corresponding to the ID information when it is determined that the remote controller does not include the control setting for the electronic device; and transmitting the obtained control key to the remote controller.