Surgery simulator is expected to help plan surgery procedures and train surgical techniques. In brain surgery, blunt dissection simulation is needed because it is a basic and important technique. Nakayama et al. proposed a method of computing fracture of soft tissue for blunt dissection simulation. However real-time simulation had not been achieved because of its high computational cost. This paper shows the system of the blunt dissection simulator with a haptic interface, and proposes a method for construction of real brain Finite Element Method(FEM) model by scanning the surface of a pig brain using a laser displacement sensor. Additionally the real-time performance of the simulator which parallelized by a multi-core processor is evaluated.