A communication method and apparatus are provided. A terminal obtains first information and second information, the first information is used to determine a length of a first-type symbol component, the second information is used to determine at least one of a length of a second-type symbol component and a length of a third-type symbol component, and the length of the first-type symbol component is greater than the length of the third-type symbol component. The terminal determines a plurality of signal blocks based on the first information and the second information, and processes each of the plurality of signal blocks to obtain an OFDM symbol corresponding to the signal block and sends the OFDM symbol.