SERVER DEVICE MULTIPLY BELONGING TO TWO OR MORE USER CLOSED NETWORK

PROBLEM TO BE SOLVED: To allow a physical one server device multiply belonging to a plurality of user closed networks to perform independent operations for every user closed networks, and to secure the closed property of user closed networks inside the multiply belonging server device. SOLUTION: The execution environment of a user process is independently constructed for each of user closed networks in an application layer in a server device so that the use of an application or file between the different user closed networks can be made exclusive. The server device is provided with a network space where those execution environments are made privately independent, and it is logically separated from the network communication path of a server program operating in each execution environment on the network so that the closed property of the user closed networks inside the server device multiply belonging to the plurality of user closed networks can be secured. COPYRIGHT: (C)2005,JPO&NCIPI