the cellular communication data bearer between the first ue and the second ue has not been established the first ue requests to establish the cellular communication data bearer and updates the tft information in an example embodiment the first ue switches the data stream and or data bearer of the d2d communication or the data stream and or data bearer of the cellular communication indicated by the mode switching information to the bearer corresponding to the indication information of the mode switching information for communication includes when the mode switching refers to switching from cellular communication to d2d communication implementing by the first ue through the d2d communication data bearer the d2d communication for the data stream indicated by the mode switching information of the first ue and the second ue by virtue of d2d communication resources of the first enb which are scheduled by the first enb or for which are competed by the first ue and when the mode switching refers to switching from the d2d communication to the cellular communication implementing by the first ue through the cellular communication data bearer the cellular communication for the data stream indicated by the mode switching information of the first ue and the second ue by virtue of cellular communication resources which are scheduled by the first enb the embodiment provides a device for mode switching fig3 is a first structural block diagram of a mode switching device according to an embodiment of the disclosure and as shown in fig3 the device includes a sending component 32 configured to send a message including mode switching information to a.