A data sending method, comprising: sending, by a first communications device, first indication information to a second communications device on a first resource, wherein the first communications device and the second communications device are User Equipment, UE, wherein the first indication information is used to indicate a location relationship between a resource on which the first communications device sends control information and a resource on which the first communications device sends data, and the location relationship is a frequency division multiplexing relationship or a time division multiplexing relationship; sending, by the first communications device, the control information to the second communications device on the first resource; and sending, by the first communications device based on the control information, the data to the second communications device on the first resource, wherein the location relationship between the resource on which the first communications device sends the control information to the second communications device and the resource on which the first communications device sends the data to the second communications device based on the control information meets the location relationship indicated by the first indication information; wherein the sending, by a first communications device, first indication information to a second communications device on a first resource comprises: sending, by the first communications device, the first indication information to the second communications device on a second resource comprised in the first resource, wherein the second resource is a resource that is of the first resource and that consists of a first decodable symbol in time domain and a resource block RB with a smallest sequence number in frequency domain. sending, by a first communications device, first indication information to a second communications device on a first resource, wherein the first communications device and the second communications device are User Equipment, UE, wherein the first indication information is used to indicate a location relationship between a resource on which the first communications device sends control information and a resource on which the first communications device sends data, and the location relationship is a frequency division multiplexing relationship or a time division multiplexing relationship; sending, by the first communications device, the control information to the second communications device on the first resource; and sending, by the first communications device based on the control information, the data to the second communications device on the first resource, wherein the location relationship between the resource on which the first communications device sends the control information to the second communications device and the resource on which the first communications device sends the data to the second communications device based on the control information meets the location relationship indicated by the first indication information; wherein the sending, by a first communications device, first indication information to a second communications device on a first resource comprises: sending, by the first communications device, the first indication information to the second communications device on a second resource comprised in the first resource, wherein the second resource is a resource that is of the first resource and that consists of a first decodable symbol in time domain and a resource block RB with a smallest sequence number in frequency domain.