1. A system for creating a dynamic floating window for generating a three-dimensional (3D) stereoscopic image, the system comprising: a sequence input unit to receive an input of left and right image sequences; a feature point extraction unit to extract feature points having a negative disparity value corresponding commonly in the left and right image sequences; a clustering unit to perform clustering and ordering on the extracted feature points, to calculate a transformation amount for the clustering, and to apply temporal consistency; a constraint unit to receive a user command and apply a user constraint; and a dynamic floating window unit to calculate a final transformation amount to which the user constraint is applied, and to create and output left and right dynamic floating windows based on the final transformation amount.