INFORMATION PROCESSING SYSTEM AND CONTROL METHOD OF THE INFORMATION PROCESSING SYSTEM

An abstraction unit converts confidential information to alternative information. An association information management unit manages association information that indicates association of the alternative information and the confidential information. A process control unit processes by using the data obtained by converting the confidential information to the alternative information. An investigation information management unit creates investigation information that indicates the operation of a storage device, by using the alternative information and collects the investigation information related to a trouble that has occurred in the storage device from among the pieces of the investigation information. A management server allows, in response to a request from an investigator terminal, the investigation information management unit to collect the investigation information related to the trouble. An SE terminal restores the alternative information included in an investigation result obtained on he basis of the investigation information by using the association information to the confidential information.