Content distribution method in information distribution system

The invention relates to a content distribution method in an information distribution system. The content distribution method is mainly used for supporting a personal video recording function under the environment that a network personal video recorder supports concentration services. A typical video-on-demand system needs to provide real-time or pre-recorded content for every subscriber in the system in a broadcast manner; besides, the real-time or pre-recorded content may be distributed to a small portion of subscriber groups in a multicast manner or to the individual subscriber in a unicast manner.