A user terminal device, comprising: a communicator configured to communicate with a display device; a detector configured periodically to detect a distance between the user terminal device and the display device; a plurality of inputters, each of the plurality of inputters configured to receive input of a user command to control an operation of the display device; a display; and a controller configured to control the plurality of inputters wherein the controller is further configured to control the display to display a user interface (Ul) which is configured to control an operation of the display device, in response to a detection that the user terminal is within a predetermined distance with respect to the display device, and characterised in that the controller is configured whereby if the detector detects that the user terminal device is within a predetermined distance with respect to the display device, the controller activates at least one of the plurality of inputters, and the controller is further configured to control the display to display content which is being displayed on the display device and a UI corresponding to the content, in response to a detection that the user terminal device is not within the predetermined distance with respect to the display device; wherein the plurality of inputters comprises a touch inputter and a proximity inputter, the touch inputter is configured to detect a touch of a user on a touch screen and the proximity inputter is configured to detect whether a user's finger or another input element is close to the user terminal device, and wherein, the controller is configured to activate the touch inputter and activate the proximity inputter, in response to a detection that the user terminal is within the predetermined distance with respect to the display device; the controller is configured to deactivate the proximity inputter in response to a detection that the user terminal device is not within the predetermined distance with respect to the display device and the touch inputter and the proximity inputter both being in an active state and the touch inputter remains in an active state. a communicator configured to communicate with a display device; a detector configured periodically to detect a distance between the user terminal device and the display device; a plurality of inputters, each of the plurality of inputters configured to receive input of a user command to control an operation of the display device; a display; and a controller configured to control the plurality of inputters wherein the controller is further configured to control the display to display a user interface (Ul) which is configured to control an operation of the display device, in response to a detection that the user terminal is within a predetermined distance with respect to the display device, and characterised in that the controller is configured whereby if the detector detects that the user terminal device is within a predetermined distance with respect to the display device, the controller activates at least one of the plurality of inputters, and the controller is further configured to control the display to display content which is being displayed on the display device and a UI corresponding to the content, in response to a detection that the user terminal device is not within the predetermined distance with respect to the display device; wherein the plurality of inputters comprises a touch inputter and a proximity inputter, the touch inputter is configured to detect a touch of a user on a touch screen and the proximity inputter is configured to detect whether a user's finger or another input element is close to the user terminal device, and wherein, the controller is configured to activate the touch inputter and activate the proximity inputter, in response to a detection that the user terminal is within the predetermined distance with respect to the display device; the controller is configured to deactivate the proximity inputter in response to a detection that the user terminal device is not within the predetermined distance with respect to the display device and the touch inputter and the proximity inputter both being in an active state and the touch inputter remains in an active state.