PROBLEM TO BE SOLVED: To specify a derivative relation pertaining to data arranged in different devices on the basis of logs pertaining to these data.SOLUTION: A history analyzer of the present invention comprises: a log acquisition unit for acquiring an access log to a file provided in a file provision device and a process operation log that includes information pertaining to an operation executed by a process in a file manipulation device on a file arranged in the file provision device or the file manipulation device; and an analysis unit for specifying from the access log and the process operation log an operation process having manipulated a file to be manipulated that is provided in the file provision device, extracting from the process operation log a log that satisfies a specific condition among logs pertaining to a derivation source operation that could be executed on an original file of the file to be manipulated, in accordance with the type of operation executed on the file to be manipulated, and specifying a file recorded in the extracted log as an original file for the file to be manipulated.SELECTED DRAWING: Figure 22A
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