A sending apparatus, wherein the sending apparatus comprises: a first frame generation unit, configured to generate a first frame, wherein the first frame comprises time resource indication information; and a first frame sending unit, configured to send the first frame to at least one response apparatus, characterized in that the time resource indication information comprises at least one piece of sub-time resource indication information, each piece of sub-time resource indication information is in a one-to-one correspondence with one of the at least one response apparatus, and each piece of sub-time resource indication information comprises a time resource at which the corresponding response apparatus sends feedback information for the first frame to the sending apparatus and a time resource at which the sending apparatus sends acknowledgment information for the feedback information to the corresponding response apparatus; wherein the first frame comprises a time resource indication field, and the time resource indication field is used to indicate a time resource at which the at least one response apparatus sends feedback information for the first frame to the sending apparatus and a time resource at which the sending apparatus sends acknowledgment information for the feedback information to the at least one response apparatus; and wherein the first frame further comprises a destination indication field, and when the destination indication field is a second-type value, the time resource indication field comprises at least two sub-time resource indication fields; or wherein the first frame further comprises a destination indication field, and when the destination indication field is a second-type value, the time resource indication field comprises one sub-time resource indication field; or wherein the first frame further comprises a destination indication field, and when the destination indication field is a first-type value, the time resource indication field comprises one sub-time resource indication field, and each sub-time resource indication field comprises one or any combination of the following pieces of information: a time resource indication subfield used by a response apparatus corresponding to a identifier subfield to send feedback information for the first frame to the sending apparatus, or a time resource indication subfield used by the sending apparatus to send acknowledgment information for the feedback information to the response apparatus corresponding to the identifier subfield. a first frame generation unit, configured to generate a first frame, wherein the first frame comprises time resource indication information; and a first frame sending unit, configured to send the first frame to at least one response apparatus, characterized in that the time resource indication information comprises at least one piece of sub-time resource indication information, each piece of sub-time resource indication information is in a one-to-one correspondence with one of the at least one response apparatus, and each piece of sub-time resource indication information comprises a time resource at which the corresponding response apparatus sends feedback information for the first frame to the sending apparatus and a time resource at which the sending apparatus sends acknowledgment information for the feedback information to the corresponding response apparatus; wherein the first frame comprises a time resource indication field, and the time resource indication field is used to indicate a time resource at which the at least one response apparatus sends feedback information for the first frame to the sending apparatus and a time resource at which the sending apparatus sends acknowledgment information for the feedback information to the at least one response apparatus; and wherein the first frame further comprises a destination indication field, and when the destination indication field is a second-type value, the time resource indication field comprises at least two sub-time resource indication fields; or wherein the first frame further comprises a destination indication field, and when the destination indication field is a second-type value, the time resource indication field comprises one sub-time resource indication field; or wherein the first frame further comprises a destination indication field, and when the destination indication field is a first-type value, the time resource indication field comprises one sub-time resource indication field, and each sub-time resource indication field comprises one or any combination of the following pieces of information: a time resource indication subfield used by a response apparatus corresponding to a identifier subfield to send feedback information for the first frame to the sending apparatus, or a time resource indication subfield used by the sending apparatus to send acknowledgment information for the feedback information to the response apparatus corresponding to the identifier subfield.