Abstract: An apparatus, a method, an application program, and a computer readable medium thereof for processing and representing a user interface are provided. The user interface generates a plurality of options arranged in a two-dimensional menu, maps the options to a plurality of display units of a surface of a three-dimensional structure, and displays a portion of the display units. A user uses a controller to select the portion of the display units for display and to select one of the options. The user interface apparatus displays various categories and the options comprised in the categories on a screen at the same time. Consequently, the user is able to learn the structure of the two-dimensional menu, all categories, and all options at the first glance. The user can operate the user interface apparatus easily and enjoy the process of browsing and operating.