Touch panel remote controller and method for processing function on the touch panel remote controller

A touch panel type remote controller and a function performing method of the touch panel type remote controller are provided to enlarge an OSD(On Screen Display) picture corresponding to a desired function, thereby easily operating a complicated remoter controller through a screen. A main OSD picture for graphic user interface is displayed on a touch panel type screen having a plurality of coordinate values. When a desired function key is selected on the main OSD picture by screen touch of a user, an enlarged OSD picture for graphic user interface corresponding to the selected function key is displayed on the screen. When a function key is selected on the enlarged OSD picture by screen touch of the user, a function corresponding to the selected function key is performed.