Abstract: The cloud computing system includes a mounting process unit that performs a process for mounting an external storage managed by an entity that is different from an entity that is providing a cloud computing service effected by said cloud computing system; a user information storage unit for storing in an associated manner user identification information for a user who is using said mounted external storage and network identification information for said external storage; and a cloud control process unit for using information stored in said external storage to execute, for a user terminal used by said user, a control process for said cloud computing system.