Abstract: A document file administrative system includes a plurality of client computers each accessible by a user, a server computer containing document files each having an attribute relating to a node constituting a tree for hierarchically classifying the document files in a project, a network connecting the plurality of client computers with the server computer to thereby enable a user to search out a document file by a given attribute. A user is allowed to duplicate a selected document file by user's request. The server computer has a closed database for containing data which only registered users are authorized to access to, and an opened database for containing data which any user is authorized to access.