Embodiments of this application provide an information sending method and an information receiving method. A network device receives a random access signal of a terminal device from the terminal device on a random access resource, where the random access resource is on a first uplink carrier or a second uplink carrier, and the first uplink carrier and the second uplink carrier are corresponding to a same downlink carrier; the network device determines a random access identifier corresponding to the random access resource according to a time-frequency resource sequence number of the random access resource and a carrier identifier of a carrier on which the random access resource is and the network device generates a random access response based on the determined random access identifier, and sends the random access response to the terminal device via the downlink carrier.