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