1. A scroll control method using a touchpad, comprising the steps of: predefining a region on the touchpad for further determining if a scroll function is to be executed thereafter; detecting a landing of an object on the region; triggering the scroll function in response to the landing; detecting a movement of the object sliding on the touchpad; calculating a distance of the movement for determining a scrolling signal; and terminating the scroll function in response to a leaving of the object from the touchpad.