A shredder system comprising: an information processing device; a retention container that retains a medium having information fixed thereon when a first person feeds in the medium; a shredder configured to shred the medium retained in the retention container; a scanner device; and a supervisor terminal used to retrieve information of the medium, the scanner device being provided within the retention container and being configured to read the information fixed on the medium at a predetermined time before the medium is shredded by the shredder, wherein a second person different from the first person provides an information retrieving instruction via the supervisor terminal, the information processing device including an information acquisition unit configured to acquire the information read by the scanner device, an information management unit configured to manage the information acquired by the information acquisition unit in a recoverable manner, and a display control unit that, upon receiving the information retrieving instruction from the second person on the supervisor terminal, retrieves the information managed by the information management unit and executes control to display the information on the supervisor terminal, wherein the information management unit manages the information acquired by the information acquisition unit in association with various metadata generated for search, including character recognition information of a part of the medium itself and a date, and the supervisor terminal communicates with the information processing device via a predetermined network, and during the period in which the medium is retained in the retention container, a decision as to whether or not to shred the medium is made by the second person on the supervisor terminal based on the information of the medium retrieved through the operation of the supervisor terminal. an information processing device; a retention container that retains a medium having information fixed thereon when a first person feeds in the medium; a shredder configured to shred the medium retained in the retention container; a scanner device; and a supervisor terminal used to retrieve information of the medium, the scanner device being provided within the retention container and being configured to read the information fixed on the medium at a predetermined time before the medium is shredded by the shredder, wherein a second person different from the first person provides an information retrieving instruction via the supervisor terminal, the information processing device including an information acquisition unit configured to acquire the information read by the scanner device, an information management unit configured to manage the information acquired by the information acquisition unit in a recoverable manner, and a display control unit that, upon receiving the information retrieving instruction from the second person on the supervisor terminal, retrieves the information managed by the information management unit and executes control to display the information on the supervisor terminal, wherein the information management unit manages the information acquired by the information acquisition unit in association with various metadata generated for search, including character recognition information of a part of the medium itself and a date, and the supervisor terminal communicates with the information processing device via a predetermined network, and during the period in which the medium is retained in the retention container, a decision as to whether or not to shred the medium is made by the second person on the supervisor terminal based on the information of the medium retrieved through the operation of the supervisor terminal.