1. A 3D human interface apparatus for facilitating 3D pointing and controlling command inputs by an operator, comprising: image input means for entering a plurality of time series images of an object operated by the operator into a motion representing a command; feature point extraction means for extracting at least four feature points including at least three reference feature points and one fiducial feature point on the object, from each of said images; motion recognition means for recognizing the motion of the object by calculating motion parameters, according to an arline transformation determined from changes of positions of the reference feature points on said images, and a virtual parallax for the fiducial feature point expressing a difference between an actual position change on said images and a virtual position change according to the affine transformation; and command input means for inputting the command indicated by the motion of the object recognized by the motion recognition means.