PROBLEM TO BE SOLVED: To provide a means which is located between a local network and an external network, not required to be modified for or registered on a gateway connected to the external network, and used for starting communications from an optional computer located on the external network toward a computer located on a local network that can be connected to the external network through a technique, such as an IP masquerade or the like.;SOLUTION: A virtual circuit is built at a node having global IP addresses using the IP masquerade that is well-known now, the node on a local network is accessed through the Internet or the like using the virtual network, and a means for discriminating the nodes located on the local networks resting on a single global IP address can be obtained by analyzing the communication contents. By this setup, in an environment where local IP addresses are used in local networks, such as intranets, LAN or the like, the problem, wherein a means for having direct access to a node on the above network from the Internet or the like can not be found, can be solved.;COPYRIGHT: (C)2005,JPO&NCIPI
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