1. A rate control method for multi-layered video coding, the method comprising: receiving as inputs different first and second target bit rates, and video data; encoding the input video data at a first layer for the first target bit rate; generating encoding statistical information based on the result of encoding input video data at the first layer; determining target numbers of bits to be respectively assigned to regions of a second layer, based on the encoding statistical information; and encoding the input video data at the second layer for the second target bit rate, based on the target numbers of bits, wherein the second target bit rate is greater than the first target bit rate.