A display device includes a display for displaying at least one piece of content, a user input interface for receiving a signal from a remote control device, and a controller for controlling operation of the display device. The controller performs control to display a video of first content in an overall area of a first layer of a screen, to display a first on screen display (OSD) window having predetermined first transparency in a first area of a second layer of the screen upon receiving a first OSD window output request signal, and to change the first transparency to predetermined second transparency when a pointer is located in the first area of the second layer of the screen.