Provided are a method and device for transmitting data in an Internet of Vehicles system. The method comprises: establishing, by a terminal device, a radio resource connection with a network device belonging to a found service cell, the network device being deployed by a first operator; receiving, by the terminal device, information of a second operator transmitted by the network device, the information of the second operator comprises at least one of identifier information and frequency resource information; receiving, by the terminal device, data transmitted by the first operator, and/or, receiving, by the terminal device, and according to the information of the second operator, data transmitted by the second operator. The invention realizes access by a terminal device, and ensures that the terminal device timely acquires information of other operators in a network, thereby enabling the terminal device to simultaneously transmit data to or receive data from multiple operator networks.