<p>The user enters, for example, a numeral string produced by numerizing the destination registered name of an e-mail according to an allocation relation denoted on the numeral keys (22) of the portable telephone (1) when the portable telephone (1) displays a waiting screen and presses down a predetermined function key. The portable telephone has a database (45) containing numeric data created by numerizing registered information according to the allocation relation and associated with the registered information. When the portable telephone recognizes that the numeral string has been entered into the portable telephone, the database is searched by using the entered numeral string as a search key, and the registered information associated with the numeric data including the numeral string is extracted. The exactly matched items out of the extracted registered information are sorted in the high rankings and displayed on a display (10) of the portable telephone.</p>
