The method 4, wherein the operation corresponding to {TAIL ~ the selected hard key} is further determined according to {HEAD ~ the displayed screen image} 
The method 4 , wherein the operation corresponding to { TAIL ~ the selected hard key } is further determined according to { HEAD ~ the displayed screen image }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD