| 摘要 |
PURPOSE: A method and device for filtering spam mails by recognizing mass of mails is provided to block and manage the spam mails effectively. CONSTITUTION: A mail managing unit(210) supplies a mail being received from an exterior in a mail storage(220), transmits a received mail to a designated user, and selects a spam mail out of received mails in accordance with a spam mail analysis result of a spam mail analysis unit(250). The mail storage(220) records a tag with respect to the spam mail selected in the mail managing unit(210), a corresponding spam mail is displayed, and checks a stored spam mail in accordance with a request of the user. A mass mail analysis unit(230) extracts the 'n' number of characters which are used frequently out of characters included in each mail received in the mail managing unit(210) as a representative character string, classifies similar mails having the same representative character string as the extracted representative character string. If the number of persons who receive similar mails having the identical representative character string is more than a predetermined number, the mass mail analysis unit(230) judges the mails as a mass of mails. A non-similar mail analysis unit(240) excludes a mail having an identical representative character string and different contents from a similar character string. The spam mail analysis unit(250) compares a keyword of a corresponding mail with a predetermined keyword, analyzes a spam mail, and supplies a spam mail analysis result to the mail managing unit(210).
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