1. A virtual clothing modeling apparatus comprising: a camera to obtain an image sequence including a plurality of images of a person who tries on clothing; a storage unit to store (A) clothes data including three-dimensional figures of clothes and patterns thereof, (B) three-dimensional figure data of the person, and (C) posture data of the person; a posture-estimating unit to estimate the posture of the person in the images within the image sequence by searching the stored posture data for a posture matching a current image in the image sequence; a time series posture data generating unit to generate time series posture data by using the estimated posture data of the person; a clothes-simulating unit to estimate the motions of the clothes tried on by the person by using the three-dimensional figure data of the person, the clothes data, and the time series posture data; a clothes image-generating unit to generate images of the clothes based on the estimated motions of the clothes; and a synthesizing unit to synthesize images of the clothes on the person in the image sequence by using the estimated motions of the clothes and the clothes data.