We proposed a distributed service oriented system with web-based interface for medical information to.. promote the practical prediction of clinical prognosis. The proposed system provided hospitals secure access for medical information and processing simulations to examine effects of surgical treatments. Through a web interface, users could operate the system in order to execute the simulations, access data from/to distributed storage, and display the medical information. These functions were combined by Web Services technique, and ontology mapping based on ICD10 was applied to combine various types of medical information. A client-side volume display using GPU was developed to visualize the result volumetric data interactively, and the system adjusted data precision dynamically to maintain the rendering speed. Being based on standardized mechanism, our framework can be applied to similar complex problems with different types of and quantities of information, such as microscopy or geography.