| 摘要 |
PROBLEM TO BE SOLVED: To provide an e-mail system which can sort out e-mails quickly and correctly. SOLUTION: The e-mail system 1 is equipped with a first encryption section 3a which is connectable to a first storage section 2; a second storage section 4 which stores a cipher text; an information extraction section 6 which is enabled to be connectable to a receiving section 5 and extracts information from an e-mail; a second encryption section 3b; a third storage section 7 for storing a cipher text; and a relatedness determining section 8 which determines whether the cipher text is related or not. COPYRIGHT: (C)2007,JPO&INPIT
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