This invention provides a device and method for enhancing flexibility of interface between 3G communication module and application processor. The device comprises the 3G communication module, the AP and an interface transfer module connected between them, wherein the interface transfer module is configured to perform bus transfer. A bus interface of the 3G communication module adapted to voice service data and a bus interface of the AP adapted to voice service data are directly connected. The bus transfer in the present invention is: the interface transfer module converts the bus data format of the non-voice service data adapted to the 3G communication module or the AP into the bus data format of the non-voice service data adapted to the AP or the 3G communication module. With this invention, the 3G communication module can be connected with various APs conveniently, and the generality of the 3G communication module is improved.