To prevent the generation of disadvantage that unnecessary advertisements or direct mails are sent at the time of disclosing the real address of an electronic(E) mail by an entry to a prize or the like.

Only a virtual address independent of a real address is disclosed as an E mail address, and at the time of receiving an E mail, the real address of a transferred destination corresponding to the virtual address is retrieved from a user data base 205, the E mail is transferred to the transferred destination, and when the number of accumulated transfer mails exceeds the upper limit of transfer frequency, invalidating processing is reserved. The reserved invalidating processing is quickly executed after ending the transfer of the E mail to its real address. When a user requires automatic continuation, a new virtual address is automatically prepared so that an E mail to the new virtual address is transferred to the user's real address.