In the Hiroshima University the computer system has been replaced at April 2005. The HPC(High Performance Computing) environment using the terminals for education is included in this new system. It is the first attempt in the point of using the idle time of the terminals for education. In this letter, we discuss a technical method to use it as a calculation resource like PC cluster and/or Computational Grid. And we report the detail of the design and the construction of the system introduced into Hiroshima University.