A display apparatus including a user input unit and a display unit on which an image is displayed according to the input video signal, includes a user interface (UI) generator producing a UI information signal in order to display UI information; a processor which receives at least one of the video signal and the UI information signal and processes the received signal so as to be displayed on the display unit; and a controller which controls the UI generator and the processor so that the UI information is displayed on a portion of the display unit, and the image is scaled to a predetermined size to be displayed on another portion of the display unit, when display of the UI information is requested via operation of the user input unit.