| 摘要 |
<p>A network system for realizing a stable secure communication in a LAN is provided. The system includes a WAN such as the Internet, the LAN connected to the WAN through a local server, and a plurality of facility devices connected to the LAN and WAN. The local server acquires identifiers applied to the objects of all the facility devices in the LAN and reports them to a center server connected to the WAN. The center server contains the correspondence relationships of the identifiers with respect to the approval of access between all the facility devices, extracts only the correspondence relationship of the identifiers concerning the approval of the access between the facility devices in the LAN in response to the report, and sets them in the local server.</p> |
