A document management system includes a reception unit that receives a designated document that has been designated by a user, an extraction unit configured to extract signature information from the received designated document, a search unit configured to search a database for another document having signature information that matches the signature information extracted by the extraction unit, the another document being a different version of the designated document, and a display control unit configured to, based on a result of the search, perform control to display document information of the designated document and document information of the another document in association with version information determined based on the signature information.