A data processing apparatus and method relate to the technical field of communication networks and are used for solving the problem of how to reduce the complexity of logging into an OTT service. The method comprises: acquiring, by a UE (101), registration information about an OTT service carrying an IMSI corresponding to a target SIM card, sending the registration information to a target server corresponding to the OTT service, when the target server corresponding to the OTT service succeeds in authenticating the registration of the registration information, sending a registration response comprising registration success information to the UE (101), wherein the UE (101) can determine login information corresponding to the OTT service by means of the registration response, and then storing, by the UE (101), the login information corresponding to the OTT service into the target SIM card, thereby acquiring the login information from the target SIM card when the target OTT service is logged into. The solution is suitable for being employed to process data.