Various embodiments provide a data transmission method and apparatus. In those embodiments, a first device sends first indication information in a first frequency band, where the first indication information is indicative of a resource in a second frequency band, used by the first device and the second device to perform data transmission. In those embodiments, the first device performs, based on the scheduling information, data transmission with the second device, using the resource in the second frequency band. Those embodiments can schedule a device based on a plurality of frequency bands to perform data transmission. In this way, a larger bandwidth is used, a throughput rate is increased, and system performance is improved.