A display apparatus used in a hand-held device is provided. The display apparatus includes a primary display, a secondary display, a plurality of input devices, and a processing unit. The primary display is a non-volatile display, and the secondary display is a volatile display. The input devices are for operational inputs. The input devices include a first input device and a second input device. The first input device is for updating a detailed view information displayed on the primary display, and the second input device is for confirming operational inputs on the input devices. The processing unit displays a preview information on the secondary display in response to the operational input of the first input device, and updates the primary display with the detailed view information corresponding the preview information in response to the operational input of the second input device. A related method is also provided.