Patent ID: 8386536

Claim:
A gateway server connected to a file server and a client terminal through a network, comprising: a unit that filters structure information of a folder and a file stored in said file server has based on access authorization of a user of said client terminal on said user basis and presents the filtered structure information of said folder and file to said client terminal of a user who has access authorization for the folder and the file, wherein said unit comprises: a file server structure information management unit that obtains and manages structure information of said folder and file on said file server; and a file and folder filtering control unit that filters the structure information of said folder and file obtained by said file server structure information management unit based on the access authorization of the user of said client terminal and provides the obtained information to said client terminal, wherein said file server structure information management unit holds the obtained structure information of the folder and the file of said file server by a predetermined data structure, and said file and folder filtering control unit filters the structure information of said folder and file obtained by said file server structure information management unit based on the access authorization of the user of said client terminal and extracts structure information of the folder and the file to be presented to the client terminal of said user to hold the extracted structure information of the folder and the file by a predetermined data structure, and wherein the access authorization of the user is to at least either one of read and write to said folder and file, wherein when the structure information of said folder and file filtered and presented to said client terminal is changed by said client terminal, said file and folder filtering control unit receives change information for the structure information of said folder and file from said client terminal to update the structure information of said folder and file managed, and upon receiving a notification from said file and folder filtering control unit, said file server structure information management unit updates the structure information of said folder and file and notifies change information for the structure information of said folder and file to said file server having the updated structure information of said folder and file.