| 摘要 |
PROBLEM TO BE SOLVED: To prevent an illicit access from an external network, and to effciently transfer a data within an internal network, in a computer connected to the internal newtwork. SOLUTION: A line switch part 21 is provided between a LAN1 as the internal network in limited meaning, and a WAN3 as the external network. The switch part 21 is switched between a connected condition and a disconnected condition by control of a control part 22, and an access from the WAN3 to the computer 11 in the LAN1 gets impossible in the disconnected condition. Even when the switch part 21 is brought into the disconnected condition, the fellow computers 11 in the LAN1 are under the connected condition to transfer the data freely.
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