In response to a forming request, an archiver forming module compresses a data file on a network and stores into an archiver. In response to a referring request, an archiver referring module reads out the compressed data file from the archiver, reconstructs on the network, and stores the reconstructed data file into the archiver. An archiver managing module concentratedly manages the archiver on the network. An archiver concentration type processing apparatus in a sharing group is set to a host and remaining archiver distribution type processing apparatuses are set to clients. The archiver, archiver forming module, and archiver referring module are arranged in each of the host and the clients. Concentration processes and distribution processes are allowed to mixedly exist on the network.
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