1. An apparatus for extracting a feature, comprising: a processor, comprising; a level set generator to generate a plurality of level sets using a plurality of depth image divided based on a predetermined interval, and the plurality of depth image having a pixel value according to depth information of each level; a feature extractor to extract a feature for each level set of the plurality of depth image, wherein the level set generator generates the plurality of level sets by comparing depth information of each pixel in the plurality of depth image with depth thresholds to generate binary values for each level of the plurality of level sets, wherein each depth threshold corresponds to a respective level of the plurality of level sets, and wherein the feature extractor extracts the feature from a depth image of each level using a descriptor extracting shape information: and an information selector to select movement information or posture information corresponding to the extracted features.