| 摘要 |
To members of a user group, messages and documents registered in the user group are presented, while, to other users than the members of the user group, documents preset as available also to other users than the members of the user group are presented, and as a registration destination of the messages, a user group where the contents of the message, or the message and messages and documents that are most similar to the contents of the documents corresponded thereto is searched and presented at request from users.
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