A display device including a display module configured to display a content corresponding to a video on a main screen of the display device; an interface module configured to receive an enlargement input request from a remote controller; and a controller configured to enter an enlargement mode in accordance with the enlargement input request received from the remote controller, display a window including the content displayed on the main screen, display an indicator for selecting a specific area of the displayed content within the displayed window, enlarge the selected specific area of the displayed content, and display the enlarged selected specific area of the displayed content on the main screen.