I investigate the fundamental phenomena in the plasma physics, such as magnetic reconnection which releases the magnetic field energy in the magnetized plasma. My research method is numerical simulation by supercomputer. The simulation model is Particle-in-Cell (PIC) simulation which solves selfconsistently the equation of motion for electrons and ions, and Maxwell equation for electromagnetic field. It is important to develop and optimize the algorithms for efficient calculation by computer because the PIC method deals with enormous particles. It is an important research topic how to model the outer situation of the simulation box because the simulation box of PIC simulation can correspond to just a tiny part of the system even if it is possible to perform a large-scale simulation. Moreover, it is impossible to store all the simulation results because the size of the hard disk is limited. I’m also working on the researches about the methodology in the data compression, and the in-situ visualization. Simulation results are merely a row of numbers. Accordingly, it is a big issue of simulation research to find what physics laws are hidden in the results.I’m also studying the visualization by using the advanced visualization technologies including the virtual-reality technology. Visualization technology can be applied not only to simulation research but also to the experiment research and reactor engineering. Furthermore, the subject of the visualization research is expanded to the interdisciplinary researches, such as other natural sciences, social sciences, information sciences and so on. I advance the studies in collaboration with the researchers on plasma physics, fusion science, computational science, computer science, visualization and so on in Japan and foreign countries.