| 摘要 |
An information processing system including: a sender information holding unit that stores an email address of a sender of an email in correlation with one of a plurality of sender categories; and an importance level estimation unit that determines, for each of the plurality of sender categories, importance levels of emails having sender addresses that belong to each of the plurality of sender categories from a plurality of importance level categories, while employing information of emails previously received by a user, and designates the importance levels in correlation with the sender categories; wherein information of the importance level categories obtained by the importance level estimation unit is subjected to a predetermined process.
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