The invention provides a server, a terminal, a data management system and a data management method. The server comprises a protocol generating module, a protocol sending module, a request receiving module and a processing module, wherein the protocol generating module is used for generating an access protocol according to a generation instruction when the generation instruction of the access protocol is received; the protocol sending module is used for sending the access protocol to the terminal, so that the terminal defines a management request for data in the server according to the access protocol; the request receiving module is used for receiving the management request; the processing module is used for analyzing and responding to the management request. According to the technical scheme, the terminals of different platforms can manage data in the server according to the access protocol defined by the server, so that the convenience of data management is improved.