Channel switching method, channel switching device, and channel switching system

A channel switching device, comprising:

• a sending module, configured to send a channel switching request to a network buffer apparatus to request switching to a second channel, or send a request for joining a multicast group of the second channel to a network node;
• a receiving module, configured to receive a video stream of the second channel buffered by the network buffer apparatus according to the channel switching request sent by the sending module, or receive a video stream of the second channel sent by the network node according to the request for joining the multicast group sent by the sending module;
• and
• a detection module, configured to detect the buffered video stream after the receiving module receives the video stream buffered by the network buffer apparatus, and feedback a detection result to the network buffer apparatus, so that the network buffer apparatus dynamically adjusts a sending speed of sending the buffered video stream to a client according to the detection result.