Patent ID: 8823978

Claim:
A document management system, in which a user is permitted to refer to a document whose owner having registered the document is a member of a group to which the user belongs, including a primary storage server a secondary storage server and a master server, the document management system comprising: a storage unit that is included in the primary storage server and configured to store document information about the document including owner information for identifying the user who has registered the document and group information for identifying a group to which the user belongs in a primary storage server storage device for each group based on the group information included in the document information; a specification unit that is included in the secondary storage server and configured to specify the group information for identifying the group to which the user who accesses the document belongs; an acquisition unit that is included in the secondary storage server and configured to acquire the document information about the group information specified by the specification unit from the primary storage server storage device; a storage unit that is included in the secondary storage server and configured to store the document information acquired by the acquisition unit in a secondary storage server storage device for each user based on information about the user who accesses the document; a storage unit included in the master server and configured to store the document information about the document registered by each of a plurality of users in a master server storage unit for each owner based on owner information included in the document information; a communication unit included in the master server and configured to transmit the document information stored in the storage unit to the primary storage server; and a communication unit included in the primary storage server and configured to receive the document information from the master server, wherein the storage unit of the primary storage server stores the document information in the primary storage server storage device for each group based on the group information included in the document information received by the communication unit.