In a system in which a client, a plurality of output devices, and a server are connected via a network, it is an object to enable a device driver to be installed into the server by a remote operation of the client and eliminate troublesomeness upon setting of a construction of a port. A Web server has a port constructing unit and a driver installing unit which operate in response to a remote instruction from the client and its construction is realized by making those units operative under the local system authority.