Abstract. We have developed an interactive visualization software for an immersive 3D virtual environment system, which generates stereoscopic images from huge human volume datasets in real-time using an improved volume visualization technique. Our software utilizes a CAVE system to reconstruct such huge volume datasets as the Visible Human and the Visible Korean Human, produced by NLM and KISTI, respectively. In stead of using the isosurfacing and 3D texture-mapping based volume rendering methods that easily slow down as data sizes increase, our system exploits a new image-based rendering technique to guarantee the effective interactive visualization.