PURPOSE: To reduce a transmission mistake of a text due to a change in the registered content of one easy step dial or abbreviation dial by rejecting the registration processing so long as a password is not entered to inform the rejection in the case of registration change of destination information having identification information added thereto.

CONSTITUTION: Registration of destination information is attained together with a prescribed password and identification information is added to destination information registered together with the password and so long as the password is not entered in the registration change of destination information added with the identification information and it is informed. Thus, rewrite of destination information by lots of unspecified operators is avoided and a specific manager manages the destination information. Thus, the transmission mistake of a text attended with a change in the registered content of one easy step dial or abbreviation dial is reduced.