| 摘要 |
To eliminate necessity of transmitting user data containing confidential information to an external network and necessity of preparing a proper environment for a user to execute an application. A web service system includes a virtualization platform on a local site side and a virtualization platform on a remote site side. The virtualization platform on the local site side includes: a network processor which separately establishes communication lines connected, respectively, to the client machine and to a network processor of the virtualization platform on the remote site side; a confidential data control section which judges whether the user data contains confidential information, and determines the destination; and a virtual machine service section which, upon receiving the judgment result indicating that the user data contains the confidential information, executes migration of the virtual machine of the virtualization platform on the remote site side to the virtualization platform on the local site side.
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