1. A method for controlling a touch system, comprising: sensing a track of an indication object on a touch pad; continuously obtaining motion vectors according to the track of the indication object; generating a candidate motion vector by summing a plurality of unweighted motion vectors, and nonlinearly generating a target motion vector according to the candidate motion vector; moving a target shown on a display panel according to the target motion vector, wherein a displayed track over which the target is moved on the display panel represents a smoother version of the track of the indication object on the touch pad; and when the candidate motion vector is smaller than a predetermined value, determining the indication object being on any area of the touch pad stopped moving, and continuing to move the target along a direction of the candidate motion vector; wherein each of the motion vectors represents a moving distance and a moving direction from a position of the indication object to a next position of the indication object, and the indication object is on the touch pad of the touch system.