A modulating operation interface and a method are applied for a display apparatus. The modulating operation interface comprises a display unit, a selection unit, a clock unit and a processor. A circle broadcast action of a plurality of operation diagrams is displayed by the display unit. One operation diagram from the plurality of operation diagrams broadcasted by the display unit is then selected by the selection unit. An internal menu of lower level is expanded from the selected operation diagram. The circle broadcast action executed by the display unit is controlled by the processor based on a predetermined time and a time data provided by the clock unit. Accordingly, the modulation can be finished completely and speedily while modulating the modulating operation interface.