A display device including a wireless communication unit configured to provide wireless communication; a touch screen; a user input unit configured to receive an input of identification information for a user authentication; and a controller configured to launch a first mode for performing a general payment function in response to the input identification information matching stored identification information, display on the touch screen a display object containing payment card information in the first mode, and switch from the first mode to a second mode for performing a separate processing mode in response to a preset first touch gesture on the touch screen.