Abstract: An alphanumeric registration method and device using a push button telephone with alphanumeric entry keys is disclosed. Alphanumeric characters are classified into group information and party information representative of ten arabic numerals, alphabetic capital letters, and alphabetic small letters. When two successive key strokes corresponding to the group and party information are made, an alphanumeric registration subroutine is executed, thereby storing a single alphanumeric character corresponding to the selected group and party in a predetermined register. Accordingly, a user can easily register information such as a telephone number and/or an identification code by utilizing the alphanumeric entry keys. The present invention is widely applicable to many types of products having alphanumeric entry keys, including, but not limited to facsimile machines, high performance telephones, voice mailing systems (VMS) and audio response systems (ARS).