A streaming media transmission method, the method comprising: receiving, by user equipment, UE, user service description, USD, information and a media presentation description, MPD, file of a first media file, wherein the first media file comprises a media stream file at at least one quality level, the media stream file at each quality level separately comprises one media content segment or more continuous media content segments, the USD information comprises a delivery method element, the delivery method element comprises indication information, the indication information is used for indicating a first media stream file that is of the first media file and sent in a unicast manner, and the indication information is further used for instructing the UE to acquire a media content segment of the first media stream file from a packet switched streaming service, PSS, server in a unicast manner when the UE is not in a multimedia broadcast multicast service, MBMS, service area; and when the UE is not in an MBMS service area, acquiring a media content segment of the first media stream file from the PSS server in a unicast manner according to the indication information; wherein the indication information comprises first unicast transmission information, the first unicast transmission information comprises a first URI, a second URI, and a corresponding relationship between the first URI and the second URI, the first URI is used for indicating an entry address of the first media stream file of the first media file in an original server, and the second URI is used for indicating an entry address of the first media stream file of the first media file in the PSS server; wherein the acquiring a media content segment of the first media stream file from the PSS server in a unicast manner according to the indication information comprises: determining a second URI of the first media stream file or a second URI of a currently-to-be-acquired media content segment of the first media stream file according to the corresponding relationship between the first URI and the second URI in the indication information; sending a media content segment request to the PSS server according to the determined second URI; and receiving the media content segment, from the PSS server, of the first media stream file. receiving, by user equipment, UE, user service description, USD, information and a media presentation description, MPD, file of a first media file, wherein the first media file comprises a media stream file at at least one quality level, the media stream file at each quality level separately comprises one media content segment or more continuous media content segments, the USD information comprises a delivery method element, the delivery method element comprises indication information, the indication information is used for indicating a first media stream file that is of the first media file and sent in a unicast manner, and the indication information is further used for instructing the UE to acquire a media content segment of the first media stream file from a packet switched streaming service, PSS, server in a unicast manner when the UE is not in a multimedia broadcast multicast service, MBMS, service area; and when the UE is not in an MBMS service area, acquiring a media content segment of the first media stream file from the PSS server in a unicast manner according to the indication information; wherein the indication information comprises first unicast transmission information, the first unicast transmission information comprises a first URI, a second URI, and a corresponding relationship between the first URI and the second URI, the first URI is used for indicating an entry address of the first media stream file of the first media file in an original server, and the second URI is used for indicating an entry address of the first media stream file of the first media file in the PSS server; wherein the acquiring a media content segment of the first media stream file from the PSS server in a unicast manner according to the indication information comprises: determining a second URI of the first media stream file or a second URI of a currently-to-be-acquired media content segment of the first media stream file according to the corresponding relationship between the first URI and the second URI in the indication information; sending a media content segment request to the PSS server according to the determined second URI; and receiving the media content segment, from the PSS server, of the first media stream file. determining a second URI of the first media stream file or a second URI of a currently-to-be-acquired media content segment of the first media stream file according to the corresponding relationship between the first URI and the second URI in the indication information; sending a media content segment request to the PSS server according to the determined second URI; and receiving the media content segment, from the PSS server, of the first media stream file.