2. The document collection system according to claim 1 , further comprising a management system rewriting the system configuration information stored in the first storage section in response to an instruction from an administrator of the search system to the management system of the search system to change the system configuration.
2. The document collection system according to claim 1 , further comprising a management system rewriting the system configuration information stored in the first storage section in response to an instruction from an administrator of the search system to the management system of the search system to change the system configuration. 3. The document collection system according to claim 2 , wherein a feature value uniquely indicating the change in the system configuration is used as the system configuration information stored in the first storage section.