A portable apparatus and an operation method thereof are provided. The portable apparatus has a screen and a touch pad, and a touch area of the touch pad is mapped to a display area of the screen. In the operation method, a first touch operation is detected by using the touch pad, and a cue area is displayed at a first display position on the screen mapped to a first touch position of the first touch operation. A second touch operation is detected by using the touch pad, and whether a second display position on the screen mapped to a second touch position of the second touch operation is within the cue area is determined. If the second display position is within the cue area, an operation function is executed on an object within the cue area. Otherwise, the cue area is moved to the second display position.