Patent ID: 7324809

Claim:
A portable telephone set comprising: a database with data stored therein, a temporary memory for storing a received mail, a first means for checking whether a preliminarily registered password, registered in the database, is contained in the received mail, a second means for checking, when the password is found to be contained, whether a letter train other than the password is also contained in the received mail, a means for retrieving, when the other letter train is found to be contained in the received mail, data from the database by using the other letter train, a means for mail returning, when data corresponding to the other letter train is found to be in the database, the corresponding data to a source of transmission of the received mail, and a data-to-voice conversion unit configured to, when the data corresponding to the other letter train is not found in the database when the first checking means has determined that the preliminarily registered password is contained in the received mail, converting a message indicating that the data corresponding to the other letter train is not found in the database into voice data, wherein when the data corresponding to the other letter train is not found in the database when the first checking means has determined that the preliminarily registered password is contained in the received mail, this fact is mail returned to the source of transmission of the received mail, wherein the temporary memory is independent from the first means, the second means, the retrieving means, the mail returning means, and the database, and wherein the converted message is output by the mail returning means to be played as a voice message at the source of transmission of the received mail.