Vulnerabilities resistant server system and software thereof

摘要

The present invention aims to provide a server system and software thereof improved so that the server system can be reliably protected from the attacks targeting the vulnerabilities peculiar to the server system. A host operating system 11 is operated in association with hardware 10 and a virtual machine of a real machine is emulated by an emulator 12 so that this virtual machine operates as an active system 13. Attack targeting the active system 13 is detected by a behavior monitoring mechanism 15 and thereupon an active system substituting mechanism 16 activates another active system.