An access point for allocating initial sending times, sending periods and service periods for transmission of video streams from at least two stations, comprising: a processing module, configured to allocate initial sending time and sending periods of intra frames to the at least two stations associated with the access point, wherein an interval between initial sending time of intra frames of any two stations whose intra frame sending time is adjacent of the at least two stations is not equal to a difference between intra frame sending periods of the any two adjacent stations, and the interval between the initial sending time of the intra frames of the any two adjacent stations is greater than 0; and a transceiver module, configured to send an initial sending time and a sending period of an intra frame to each station of the at least two stations, wherein the processing module is further configured to allocate an intra frame service period and a predictive frame service period to each station according to the initial sending time and the sending period of the intra frame of each station, wherein each station exclusively occupies a channel in the intra frame service period and the predictive frame service period, and an interval T between intra frame service periods of the any two adjacent stations meets the following condition: T min ≤ T ≤ T max, wherein T min and T max are determined by the access point according to the initial sending time and the sending period of the intra frame of each station; and the transceiver module is further configured to send, to each station, a result of allocating the intra frame service period and the predictive frame service period to each station. a processing module, configured to allocate initial sending time and sending periods of intra frames to the at least two stations associated with the access point, wherein an interval between initial sending time of intra frames of any two stations whose intra frame sending time is adjacent of the at least two stations is not equal to a difference between intra frame sending periods of the any two adjacent stations, and the interval between the initial sending time of the intra frames of the any two adjacent stations is greater than 0; and a transceiver module, configured to send an initial sending time and a sending period of an intra frame to each station of the at least two stations, wherein the processing module is further configured to allocate an intra frame service period and a predictive frame service period to each station according to the initial sending time and the sending period of the intra frame of each station, wherein each station exclusively occupies a channel in the intra frame service period and the predictive frame service period, and an interval T between intra frame service periods of the any two adjacent stations meets the following condition: T min ≤ T ≤ T max, wherein T min and T max are determined by the access point according to the initial sending time and the sending period of the intra frame of each station; and the transceiver module is further configured to send, to each station, a result of allocating the intra frame service period and the predictive frame service period to each station.