System and method for providing video on demand preview channel through channel zapping in realtime broadcasting service

PURPOSE: A system and a method for providing video on demand preview channel through channel zapping in real time broadcasting service are provided to conveniently offer contents by selecting channels for real time broadcasting and VOD service through channel zapping. CONSTITUTION: A content management server(100) allocates plural VOD preview channels between real time channels. The content management server manages one or more VOD content information of the VOD preview channel and the VOD preview channel. A VOD preview information providing server(120) offers the VOD preview information to a set top box(140). According to the channel zapping, the set top box offers the real time channel or the VOD preview channel.