The document management system assigns property information of a scanned document when transmitting the scanned document from an MFP to a document management server PC, and stores history information related to the transmission job in a memory. Further, the MFP, on receipt of incorrectness information related to property information from the document management server PC, adds the incorrectness information to the history information. Thereafter, when a user logs into the MFP, the MFP determines whether incorrectness information is included in history information having the same user ID as a user ID of the user, and if incorrectness information is included, displays a modification screen for modifying incorrect property information. Further, once the property information has been modified via the modification screen, the MFP transmits the modified information to the document management server PC, and causes information managed by the document management server PC to be updated.