To realize a mail exchanging device whose portability is excellent at low cost by realizing the reading and writing of mails in a simple operation by using a memory card.

A mail exchanging device 1 is shaped like a portable telephone, and mail exchange is operated by writing mails in a memory card 100 for mails, or reading the written mails from the memory card 100 for mails. Also, at the time of writing the mails, the birth date of a user preliminarily set in the mail exchanging device 1 and the mail preparation date are written so that the mail can be accompanied by them, and at the time of reading the mails, compatibility is divined together with the birth date of a receiver set in the mail exchanging device 1 owned by the receiver, and a point is decided. Then, the point is stored in a point storing part, and character purchase processing is executed by using a memory card for points so that a desired character can be displayed at a display part 30.