The present invention relates to an apparatus and method for providing each subscriber with a different A/V (audio/video) stream for a single program in a digital cable broadcast environment. More particularly, the apparatus comprises: means for generating multi-screen information on the basis of the relationship between a single program and a plurality of A/V streams in the event the plurality of A/V streams exist for the same TV program; means for receiving multi-screen information; means for regenerating, from the multiplexed stream containing the plurality of A/V streams, a stream for a multi-screen service containing individual A/V streams; means for checking the bandwidth of the stream for the multi-screen service transmitted through a modulator, and a program number; communication means for checking the subscriber through a return channel, and informing a subscriber terminal of the bandwidth for transmitting the stream for the multi-screen service selected by the subscriber and the program number; and means for transmitting the stream, containing the A/V stream corresponding to the screen selected by the subscriber, for the multi-screen service.