A document managing system is provided with a plurality of document managing apparatuses each configured to retrieve a document stored in a storage according to a document ID and to judge whether or not an operation with respect to the retrieved document is possible according to a user ID that is generated with respect to each document managing apparatus, and a user ID generating apparatus provided externally to the document managing apparatuses and configured to generate a common user ID that is used in common among each of the document managing apparatuses. Each document managing apparatus has an export and import part configured to export and import data of an arbitrary document and an access control list (ACL).