A method for determining quality of an audio and video stream, wherein the method comprises: obtaining a key indicator for a target audio and video stream, wherein the key indicator comprises the following indicators within a reference time period: a maximum quantity of continuously lost packets, and a plurality of average packet receiving time intervals; and determining quality of experience, QoE, of the target audio and video stream based on the key indicator for the target audio and video stream; wherein the determining quality of experience, QoE, of the target audio and video stream based on the key indicator for the target audio and video stream comprises: determining a uniform reference unit for various indicators for the target audio and video stream, and performing weighted summation on the various indicators after the uniform reference unit is determined, to obtain a summation score; and using a difference between a full score and the summation score as a score of the target audio and video stream, and indicating the QoE of the target audio and video stream by using the score of the target audio and video stream, wherein the full score is used to indicate an upper limit of the QoE; wherein the average packet receiving time interval is used to indicate an average value of a plurality of receiving time intervals that are used for receiving the target audio and video stream and that are in any sub-time period in the reference time period, and each of the plurality of receiving time intervals is used to indicate an interval between time points for receiving two adjacent data packets. obtaining a key indicator for a target audio and video stream, wherein the key indicator comprises the following indicators within a reference time period: a maximum quantity of continuously lost packets, and a plurality of average packet receiving time intervals; and determining quality of experience, QoE, of the target audio and video stream based on the key indicator for the target audio and video stream; wherein the determining quality of experience, QoE, of the target audio and video stream based on the key indicator for the target audio and video stream comprises: determining a uniform reference unit for various indicators for the target audio and video stream, and performing weighted summation on the various indicators after the uniform reference unit is determined, to obtain a summation score; and using a difference between a full score and the summation score as a score of the target audio and video stream, and indicating the QoE of the target audio and video stream by using the score of the target audio and video stream, wherein the full score is used to indicate an upper limit of the QoE; wherein the average packet receiving time interval is used to indicate an average value of a plurality of receiving time intervals that are used for receiving the target audio and video stream and that are in any sub-time period in the reference time period, and each of the plurality of receiving time intervals is used to indicate an interval between time points for receiving two adjacent data packets. determining a uniform reference unit for various indicators for the target audio and video stream, and performing weighted summation on the various indicators after the uniform reference unit is determined, to obtain a summation score; and using a difference between a full score and the summation score as a score of the target audio and video stream, and indicating the QoE of the target audio and video stream by using the score of the target audio and video stream, wherein the full score is used to indicate an upper limit of the QoE; wherein the average packet receiving time interval is used to indicate an average value of a plurality of receiving time intervals that are used for receiving the target audio and video stream and that are in any sub-time period in the reference time period, and each of the plurality of receiving time intervals is used to indicate an interval between time points for receiving two adjacent data packets.