A user-based object approximation method and a user-based object approximation system are disclosed. The user-based object approximation method comprises the steps of: creating a medial axis form by performing an MAT for an object; carrying out a first segmentation of the medial axis form into a plurality of surface areas; adjusting the segmented surface areas through a sketch-based method; and expressing the adjusted surface areas in a three-dimensional manner by using an SSV.
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