VOD, namely Video On Demand, short for VOD, also calls interactive television-ordering system, the traditional television-system information is one-way to deliver, and customers can only be passive to accept. The essence of the £Ö£Ï£Ä is that an user of information acquires the multi-media information actively according to own need, its biggest difference from information release is : One is imitativeness; two is selectivity.

    Freely ordering the video programme and information on the computer or on the TV contained in the programme database, you can select the context of the video programma anyway you like.

    The system of VOD is composed of the software and hardware .the software contains the re-motivating exhibition of the forward desk, the context administration of the backward desk and the system of computing the costs. The hardware concludes the serving equipment for the video, the device for transformation, the device for stocking, the top box of the machine, and so on.