{HEAD ~ A user} enters {TAIL ~ a numeric string} on a standby screen of a cellular telephone , and then presses a predetermined function key, the numeric string being obtained by numerical conversion of a keyword related to a piece of registration information, e.g. a destination e mail address, in accordance with an assignment relationship between characters and numerical keys 
enters
{ HEAD ~ A user } enters { TAIL ~ a numeric string } on a standby screen of a cellular telephone , and then presses a predetermined function key , the numeric string being obtained by numerical conversion of a keyword related to a piece of registration information , e.g. a destination e mail address , in accordance with an assignment relationship between characters and numerical keys
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH