Against the background of increasing the number of cases of endoscopic surgery, more effective training system has been requested from doctors. By the way, it is important to assess the proficiency level of operating an endoscopic forceps. Then, this study aims to develop an assessment system for the operation skill of endoscopic forceps. In our system, the operation skill of endoscopic forceps is assessed by adding the disturbance to a trainee who is practicing the forceps operation. Three doctors were employed as the test subjects of this study and the differences in their proficiency levels were confirmed in our experiments.