PURPOSE: To improve the operability in such a way that a sender makes positively a mail management request and, for example, the sender cancels a mail sent n mistake by the sender or the like.

CONSTITUTION: When a mail is sent from a sender communication terminal equipment 10, a management means 21 stores the mail to a storage section 22 and manages it. When a circulation or erase request comes from the receiver with respect to the stored mail, the management means 21 processes the mail according to the request. Furthermore, when the circulation or erasure request of the mail stored once comes from the sender, the management means 21 implements the processing according to the request.