Disclosed are a bitstream decoding apparatus and a method thereof. The decoding apparatus can include: a decoder forming unit, configured to generate and output CSCI control information and connection control information by using partial decoder descriptions stored in a description storing unit; and a decoding solution, which selectively loads a plurality of functional units included in a toolbox by using the CSCI control information and the connection control information to decode a bitstream to video data. With the present invention, it is possible to decode various types of bitstreams according to each of various standards by using an identical information recognizing method.
