Feedback is provided to a marksman by placing a target graphic over a sensitive layer. If the remaining capacity of the storage medium is smaller than the required capacity of the storage medium, for example, a frame rate decimation and pixel reduction are performed upon a broadcast to be newly stored, a re-encoding processing is performed for the broadcast and then the resultant broadcast is stored in the storage medium. The inventive method then shares the available bit budget between these partitioned sub-blocks. , and subscripts \u03b1, \u03b2, \u03b3, \u03b4 and \u03b5 represent numerical values which satisfy 0.