| 摘要 |
PROBLEM TO BE SOLVED: To securely suppress the reception of information from a sender having malice and unnecessary information by enabling a user to receive various information without teaching an original identification code. SOLUTION: The user informs others of a 2nd identification code different from a 1st identification code as a substitute for the 1st identification code. Information arriving at the 2nd identification code as an address is circulated to the 1st identification code by a correspondence table 21, a matching means 222, and a circulating means 223, and a limiting means 224 limits the frequency of the circulation to a specific limited frequency.
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