The present invention provides a touch sensitive processing apparatus configured for: according to one or more first touch line pieces corresponding to one or more external objects in a first set, transmitting driving signals via one or more first electrodes corresponding to the one or more first touch line pieces and sensing the driving signals via multiple second electrodes to form at least a one-dimensional sensing information; composing a two-dimensional sensing information according to the at least a one-dimensional sensing information; preserving sensing information which is corresponding to one or more second touch line pieces in the two-dimensional sensing information, wherein the one or more second touch line pieces is a part of a second set which is corresponding to the one or more external objects; calculating one or more positions of the one or more external objects according to the two-dimensional sensing information.