1. A cellular telephone which calls up registration information to display the registration information on a display part, there being an assignment relationship established between each numerical key included among dial keys of the cellular telephone and a plurality of single characters, said cellular telephone comprising: a storage part for storing a database in which numeric data obtained by numerical conversion of a piece of registration information in accordance with said assignment relationship and said piece of registration information are associated with each other; an acceptance part for accepting a numeric string entered by using said dial keys as a call request for a predetermined piece of registration information; an extraction part for searching said database to extract pieces of registration information associated with numeric data containing said numeric string; a sorting part for rearranging an exactly matching one of the pieces of registration information extracted by said extraction part in a high rank; and a display control part for controlling said display part so as to display the pieces of registration information extracted by said extraction part in the order rearranged by said sorting part.