| 摘要 |
A system having a client ( 24 ) and a server ( 21 ) between which two virtual LAN systems are set for normal application and emergency application is disclosed. The server transmits pattern information of a harmful program to the client through the normal virtual LAN (S 11 ). The client monitors intrusion of the harmful program based on the pattern information (S 21 ), and upon detection of the harmful program, switches the virtual LAN from normal to emergency applications (S 22 ). The client transmits infection information about the harmful program to the server through the emergency virtual LAN (S 23 ). The server that has received the infection information transmits an extermination program for the harmful program to the client (S 12 ). The client, upon recognition that the harmful program is invalidated by executing the extermination program, switches the virtual LAN from emergency to normal applications (S 26 ).
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