Portable cellular phone, portable cellular phone system, message format controlling method and message format controlling program

摘要

A portable cellular phone (10) is provided which is capable of transmitting a message corresponding to a terminal of a message receiver even in a case where any one or some of terminals of message receivers have a function of receiving a message of a MMS (Multimedia Message Service) format and any one or some of the terminals do not have the function. Terminal information indicating whether or not a message of the MMS format can be received is managed by a terminal information server (20). A telephone number or E-mail address (15b) and terminal type information (15c) corresponding to a name (15a) of the message receiver is stored by the portable cellular phone (10) and terminal information is received via the Internet and updated periodically. Terminal type information (15c) corresponding to a name (15a) of the message receiver is read and a message of either of the SMS (Short Message Service) or MMS format is selected to create a message for transmission.