generating, by the mobile device, a first control signal based on the least one of the movement of the captured entity and the change of size of the captured entity, {HEAD ~ the control signal} controlling {TAIL ~ the display apparatus} 
controlling
generating , by the mobile device , a first control signal based on the least one of the movement of the captured entity and the change of size of the captured entity , { HEAD ~ the control signal } controlling { TAIL ~ the display apparatus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL