To transmit information in the best expression form according to the opposite side even when the information to be transmitted is a sort of memorandum.

In a message content and transmitting method decision table 2-3, the relations between message senders and message receivers are defined and expression forms of message contents are defined corresponding to the relations. When the relation between a message sender and a message receiver is specified at the time of the generation of message contents, a CPU 1 reads the corresponding expression form out by performing retrieval from the message content and transmitting method decision table 2-3 and alters the message contents according to the expression form. Then the altered message contents are displayed out or voiced.