1. A motion reconstruction method from inter-frame feature correspondences of a singular video stream using a motion library, comprising: a time transformation step which selects objective motions and similar motions (reference motions) from the motion library that contains various motion information, and transforms the time correspondence between the reference motions and input images using the time axis of the reference motions; an articulation reconstruction step which ascertains the articulation angles and makes the relative location relationship between the 2D feature points obtained from said input images and articulation angles to coincide; and a top articulation position inferencing step which produces an appropriate top articulation movement from the continues position information obtained from said above steps, kinematics information obtained from the input images and dynamical information obtained from said reference motions.