when {HEAD ~ part} of {TAIL ~ said numerical string} is entered on said standby screen, said call request part searches said database for a keyword containing a character string obtained by character conversion of said part in accordance with said assignment relationship to extract and display keyword candidates on said standby screen, thereby accepting a selection thereamong, and requests said acceptance part to call up said predetermined piece of registration information corresponding to a selected keyword 
of
when { HEAD ~ part } of { TAIL ~ said numerical string } is entered on said standby screen , said call request part searches said database for a keyword containing a character string obtained by character conversion of said part in accordance with said assignment relationship to extract and display keyword candidates on said standby screen , thereby accepting a selection thereamong , and requests said acceptance part to call up said predetermined piece of registration information corresponding to a selected keyword
OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH