A data transmission method and apparatus

The present invention provides a data transmission method and apparatus, the method comprising: receiving service data sent by a first terminal; wherein the first terminal is a single mode terminal or multimode terminal; a first network a first network monitoring device the rear end of the outlet forwarding traffic load; flow rate when the load reaches a preset load flow, forwarding the current mode is switched routing mode, and select the second terminal as a forwarding node of the first terminal, the second terminal is a multi-mode terminal; after forwarding the service data to the second terminal, for converting the service data to the second terminal, the second network transmits to the second network device. Example embodiments of the present invention solves the technical problems of the prior art network is low bandwidth utilization of the total outlet. So that the user at personal Bandwidth and can help others to data transmission, i.e. via a plurality of interfaces of a plurality of work devices, thereby increasing the overall throughput of the plurality of devices.