Abstract: A digitized document archiving system for saving a digitized document created from a receipt or a application form scanned by a scanner and related information created by registration device in a digitized document management device, wherein the digitized document management device performs a double scanning check with reference to a double scanning check verification and registration data for a double scanning check when it receives a double scanning check request including a characteristic quantity from the registration device, and sends the check result to the registration device, and the registration device deletes the created digitized document and the corresponding related information, if it is determined as double scanning.