The invention discloses a method, a service terminal, and a mobile terminal for realizing data transmission. The method includes: when the service terminal receives a request from the mobile terminal of an application interface, the service terminal obtains a second data version number stored by itself and corresponding to a preset application interface; the service terminal compares whether a first data version number carried by the request and the obtained second data version number are equal; and when the service terminal compares the equivalence of the first data version number and the second data version number, a notification that the mobile terminal does not need to update data is sent to the mobile terminal. According to the technical scheme, data is transmitted more rapidly, traffic waste is avoided, and user experience is enhanced.