A multi-carrier transmission method, comprising: receiving, by a network device, a data packet from an upper layer network entity, wherein the data packet comprises identifier information about a terminal; receiving, by the network device, characteristic information about the terminal sent by the terminal; wherein the characteristic information comprises a signal to noise ratio; establishing a correspondence table between the identifier information about the terminal and a broadcast channel; querying, according to the identifier information about the terminal, the correspondence table between identifier information about the terminal and the broadcast channel, wherein in the correspondence table, when a signal to noise ratio of any broadcast channel among signal to noise ratios of all broadcast channels sent by the terminal is larger than or equal to a preset signal to noise ratio threshold, the broadcast channel corresponding to the preset signal to noise ratio threshold is also corresponding to the characteristic information about the terminal; determining the broadcast channel corresponding to the identifier information about the terminal, wherein the determined broadcast channel is a broadcast channel among a plurality of preset broadcast channels, the terminal is any terminal in a terminal group corresponding to the determined broadcast channel, and the signal to noise ratio of each broadcast channel carrier is obtained by the terminal and is sent to the network device; and sending, according to the identifier information about the terminal, through the determined broadcast channel, the data packet to the terminal, wherein the data packet can be demodulated by the terminal, by using modulation parameters of the determined broadcast channel. receiving, by a network device, a data packet from an upper layer network entity, wherein the data packet comprises identifier information about a terminal; receiving, by the network device, characteristic information about the terminal sent by the terminal; wherein the characteristic information comprises a signal to noise ratio; establishing a correspondence table between the identifier information about the terminal and a broadcast channel; querying, according to the identifier information about the terminal, the correspondence table between identifier information about the terminal and the broadcast channel, wherein in the correspondence table, when a signal to noise ratio of any broadcast channel among signal to noise ratios of all broadcast channels sent by the terminal is larger than or equal to a preset signal to noise ratio threshold, the broadcast channel corresponding to the preset signal to noise ratio threshold is also corresponding to the characteristic information about the terminal; determining the broadcast channel corresponding to the identifier information about the terminal, wherein the determined broadcast channel is a broadcast channel among a plurality of preset broadcast channels, the terminal is any terminal in a terminal group corresponding to the determined broadcast channel, and the signal to noise ratio of each broadcast channel carrier is obtained by the terminal and is sent to the network device; and sending, according to the identifier information about the terminal, through the determined broadcast channel, the data packet to the terminal, wherein the data packet can be demodulated by the terminal, by using modulation parameters of the determined broadcast channel.