A communication method and apparatus are provided. The method is: receiving a radio resource control RRC connection reconfiguration message sent by a network device, where the RRC connection reconfiguration message includes one or more secondary cells configured by the network device for a terminal, information used to indicate to activate the one or more secondary cells, and a start moment at which the terminal reports channel state information CSI; and starting to report the CSI of the one or more secondary cells at the start moment.