Real-time data updating method, device and system

The invention discloses a real-time data updating method, device and system, which relates to the field of computers. The method comprises the steps that real-time data provided by an application service are acquired; for each designated object of the application service to which each first subscriber is directed, the real-time data of each designated object are extracted from the real-time data; according to the real-time data of each designated object, a real-time data message is sent to each corresponding first subscriber; the first subscriber forwards the real-time data message to a client corresponding to the subscriber through long connection; and the client carries out rendering demonstration according to the real-time data message. According to the invention, the number of states, which is maintained on the server side, of the each client is reduced, and the real-time data message is pushed; the resource consumption of the server is reduced; the client side can acquire new real-time data without frequ