A file management system comprising: - a file data storage section that stores file data (Fd1, Fd8) of a file; - a management information storage section that stores management information (Dm) identifying the file, the management information being related to the file data; - a control information storage section that stores control information (Dc) on a file to be blocked on which a predefined specified processing is to be executed; - a management information retrieval section that retrieves the management information stored in the management information storage section; - a control information retrieval section that retrieves the control information stored in the control information storage section; wherein - the management information has a plurality of pieces of management summary information (dms) indicating a summary of the file data when the file data is rewritten one or more times, each piece corresponding to each generation of the rewritten file data, - the control information has a plurality of pieces of the control summary information (dcs) indicating a summary of file data of the file to be blocked when file data of the file to be blocked is rewritten one or more times, each piece corresponding to each generation of the rewritten file data of the file to be blocked, and the system being characterized by comprising - an execution section that executes, when one of the plurality of pieces of the management summary information retrieved by the management information retrieval section matches or substantially matches with one of the plurality of pieces of the control summary information retrieved by the control information retrieval section, the predefined processing on the file data related to the piece of management summary information, wherein the management information retrieval section retrieves, when the control information is added in the control information storage section, all of the management information stored in the management information storage section, the control information retrieval section retrieves, when the control information is added in the control information storage section, the added control information, and the execution section sequentially compares pieces within a pair for each pair of pieces that is constituted of one piece of management summary information among the retrieved pieces of management summary information and one piece of control summary information among the retrieved pieces of control summary information. - a file data storage section that stores file data (Fd1, Fd8) of a file; - a management information storage section that stores management information (Dm) identifying the file, the management information being related to the file data; - a control information storage section that stores control information (Dc) on a file to be blocked on which a predefined specified processing is to be executed; - a management information retrieval section that retrieves the management information stored in the management information storage section; - a control information retrieval section that retrieves the control information stored in the control information storage section; - the management information has a plurality of pieces of management summary information (dms) indicating a summary of the file data when the file data is rewritten one or more times, each piece corresponding to each generation of the rewritten file data, - the control information has a plurality of pieces of the control summary information (dcs) indicating a summary of file data of the file to be blocked when file data of the file to be blocked is rewritten one or more times, each piece corresponding to each generation of the rewritten file data of the file to be blocked, and - an execution section that executes, when one of the plurality of pieces of the management summary information retrieved by the management information retrieval section matches or substantially matches with one of the plurality of pieces of the control summary information retrieved by the control information retrieval section, the predefined processing on the file data related to the piece of management summary information,