1. A method for producing new 3D stereoscopic video from 2D video, which can be implemented by a computer, the method comprising: segmenting input 2D video into work clips in units of cuts; generating object region extraction information from each of the work clips, wherein the generating of object region extraction information includes: determining a maximum depth value and a minimum depth value of each of the object regions extracted from the work clips, and displaying a top view visualizing the object regions having the determined maximum depth values and minimum depth values, in a 3D space viewed from above at a right angle, wherein the top view includes a plurality of polygons having different sizes and positions according to the determined maximum depth values and minimum depth values of objects, wherein object regions with a minimum depth value appear at the bottom of the top view and object regions with a maximum depth value appear at the top of the top view; and generating stereoscopic conversion work directives for each of the work clips on the basis of the object region extraction information.