An electronic apparatus includes a switch having contacts spaced from each other. The contacts are designed to independently establish electric connection. A controller unit is designed to instruct the control on an image on the screen of a display panel in the electronic apparatus when the controller unit sequentially detects the electric connection at at least two of the contacts in a predetermined time period. A sequential detection of electric connection at the contacts within the predetermined time period is utilized to effect the control of the image in the electronic apparatus. Facilitated operations can be achieved to effect the control of the image on the screen. Conventional contacts can be utilized to establish electric connection. The control of the image can be accomplished with a simple structure.