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