Apparatus and method for broadcasting scalable video data

PURPOSE: An apparatus and a method for broadcasting scalable video data are provided to support improved broadcasting and ensuring compatibility with a current broadcasting device by broadcasting video data through a heterogeneous network and a homogenous network. CONSTITUTION: A first encoding unit(103) creates a first encoding signal by encoding first broadcasting data through a first encoding mode, and a first transmission unit(105) transmits the first encoding signal through the first communication network. A decoding unit(107) generates second broadcasting data by decoding the first encoding signal. A residual signal generating unit(111) generates a residual signal from the first and second broadcasting data, and a second encoding unit(113) generates a second encoding signal by encoding the residual signal through a second encoding mode.