Desk Side Laboratory (DSLab), which allows scientists and engineers in geographically different locations to do state-of-the-art research and development through internet on their web browsers, has been developed only using commodity products. It has an easy-to-use user interface. It has been found that, when applied to an optimization design of mobile communication system, DSLab is very useful to determine optimization parameters in real time and can yield the results with high reliability in a short time. It has been expected that DSLab is useful for an interdisciplinary approach of state-of-the-art research and development.