A displaying system includes a touch screen for displaying images and/or icons thereon and providing a communicating interface; a detecting module for detecting operations on the touch screen; a setting module for setting a zoom area and/or a zoom mode in response to user inputs; a characteristic computing module for computing the location and the trace of a drawing on the touch screen and comparing the computing result with the predetermined information and thereby determining a matching zoom mode and a selection mode; a controlling module for controlling the touch screen to zooming in/out the selected object(s) corresponding to a matched zoom mode and zoom area selection mode; and a storage module for storing predetermined information corresponding to the zoom modes, the detecting result of the detecting module, the computing result of the computing module, and providing memory space for the displaying system.