A terminal and a data transmission method in an Internet of vehicles are provided. According to embodiments of the present disclosure, a terminal determines at least one first carrier carrying first service data, and further sends to a network device a data volume of the first service data carried on the at least one first carrier, so that the network device can allocate a first transmission resource to the at least one first carrier according to the data volume of the first service data carried on the at least one first carrier.