A scanner capable of functioning as a data transmission management device that makes a determination as to whether data should be allowed to be reused at a file transmission destination based on the nature of the particular destination, produces a reusable file, and transmits it to the destination, if it determines that the reuse of the data is allowed because the destination is within the area of the first network N1 to which the scanner is connected; or it produces difficult-to-reuse file and transmits it to the destination, if it determines that the reuse of the data is disallowed because the destination is outside of the area of the first network N1.