4. The method according to claim 3 , wherein after generating the playlist of the virtual channels corresponding to the keywords, the method further comprises: detecting whether any keyword in the keyword list has been changed; if any keyword in the keyword list has been changed, updating the virtual channel list according to the changed keyword list.
5. The method according to claim 4 , wherein detecting whether any keyword in the keyword list has been changed comprises one of the following: if the keyword list is received from the server, detecting addition or deletion of the keyword in the keyword list; and if the keyword list is preset by the user, detecting addition, modification or deletion of the keyword in the keyword list.