A method includes searching, in response to a received policy query request, a preset policy library for a transmission policy that matches the policy query request, wherein the policy query request comprises hardware information of a transmitting end, hardware information of a receiving end, and data information of to-be-transmitted data in the transmitting end, and wherein the data information comprises a total data volume of the to-be-transmitted data, a data category comprised in the to-be-transmitted data, and a data volume of each data category, and feeding back a query result of the policy query request to the transmitting end.