1. A marker-free motion capture apparatus having a function of correcting a tracking error, comprising: a grouping means for grouping feature candidates located within a threshold distance on a three-dimensional space at a previous time (t−1); a feature point selecting means for generating a first curve connecting a predetermined number of feature points, and selecting a feature candidate closest to the first curve among the grouped feature candidates as a feature point of a previous time (t−1); a feature point correcting means for generating a second curve connecting a predetermined number of feature points including the feature point of a previous time (t−1) selected at the feature point selecting means, and correcting a feature point of a current time (t) calculated based on a Kalman filtering scheme using the second curve; and a controlling means for calculating a location of a feature point of each time using a Kalman filtering scheme and generally controlling the means of the marker-free motion capture apparatus.