A method for accessing a video, characterized by comprising the following steps: transmitting, by a set-top box, a video request to a proxy server; receiving, by the set-top box, a media server address transmitted by the proxy server, wherein the media server address is obtained by the proxy server processing video description data acquired from the media server; and acquiring, by the set-top box, video data from the media server according to the media server address; wherein the method further comprises: receiving, by the set-top box, video navigation interface information transmitted by the proxy server, wherein the video navigation interface information is generated by the proxy server according to video classification information acquired from the media server; transmitting, by the set-top box, the video navigation interface information to a display device for the display device to display a video navigation interface; transmitting, by the set-top box, video type information selected by a user in the video navigation interface to the proxy server; receiving, by the set-top box, video classification interface information transmitted by the proxy server, wherein the video classification interface information is generated by the proxy server according to all video information included in the video type information acquired from the media server; and transmitting, by the set-top box, the video classification interface information to the display device for the display device to display a video classification interface, and, wherein the step of transmitting, by the set-top box, the video request to the proxy server comprises: transmitting, by the set-top box, the video request to the proxy server according to a video selection result of the user on the video classification interface; wherein the method further comprises: transmitting, by the media server, the video description data to the proxy server for the proxy server to process the video description data to obtain the media server address and transmit the media server address to the set-top box; and transmitting, by the media server, the video data to the set-top box for the set-top box to play the video; wherein the method further comprises: transmitting, by the media server, the video classification information to the proxy server for the proxy server to generate the video navigation interface information according to the video classification information and transmit the video navigation interface information through the set-top box to the display device for displaying; and transmitting, by the media server, the all video information included in the video type information selected by the user in the video navigation interface to the proxy server for the proxy server to generate the video classification interface information according to the all video information and transmit the video classification interface information through the set-top box to the display device for displaying. transmitting, by a set-top box, a video request to a proxy server; receiving, by the set-top box, a media server address transmitted by the proxy server, wherein the media server address is obtained by the proxy server processing video description data acquired from the media server; and acquiring, by the set-top box, video data from the media server according to the media server address; receiving, by the set-top box, video navigation interface information transmitted by the proxy server, wherein the video navigation interface information is generated by the proxy server according to video classification information acquired from the media server; transmitting, by the set-top box, the video navigation interface information to a display device for the display device to display a video navigation interface; transmitting, by the set-top box, video type information selected by a user in the video navigation interface to the proxy server; receiving, by the set-top box, video classification interface information transmitted by the proxy server, wherein the video classification interface information is generated by the proxy server according to all video information included in the video type information acquired from the media server; and transmitting, by the set-top box, the video classification interface information to the display device for the display device to display a video classification interface, and, transmitting, by the media server, the video description data to the proxy server for the proxy server to process the video description data to obtain the media server address and transmit the media server address to the set-top box; and transmitting, by the media server, the video data to the set-top box for the set-top box to play the video; transmitting, by the media server, the video classification information to the proxy server for the proxy server to generate the video navigation interface information according to the video classification information and transmit the video navigation interface information through the set-top box to the display device for displaying; and transmitting, by the media server, the all video information included in the video type information selected by the user in the video navigation interface to the proxy server for the proxy server to generate the video classification interface information according to the all video information and transmit the video classification interface information through the set-top box to the display device for displaying.