An instant messaging method and a network TV system based on a network TV, generally include: establishing at least one chat room for each network TV channel, and setting the corresponding relationship between the network TV channel and the established chat room; when a network TV user entering a network TV channel, according to the set corresponding relationship between the network TV channel and the chat room, guiding the network TV user to log in the chat room corresponding to the network TV channel and exchange the information with the other users who are watching the same network TV channel. The above method and the network TV system bind the network TV channel with the chat room, so that the network TV users who are watching a particular network TV channel could exchange the impression with the other users watching the same network TV channel through the chat room bond with the network TV channel, therefore the server experience of the network TV user could be improved greatly.
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