13. The groupware server as claimed in claim 12 , wherein said write part overwrites a document data that is added with a new document data to the document database when said communication part receives a write request for the document data that is added with the new document from the image forming apparatus.
12. The groupware server as claimed in claim 9 , wherein said write part overwrites changed attribute information to the document database when said communication part receives a write request for the changed attribute information corresponding to a changed document data from the image forming apparatus.