— In recent years, a lot of companies and laboratories start to announce their various prototype service robots. As we could know in that point, the market for intelligent service robots is expected to grow in future. Then it is expected that customers demand more performance to a robot to be fitted for them when a robot is supplied widely. In the present paper we shall see the robot’s variation of behavioral personality from the experiments. These results show that by adjusting the parameters related to robot perception, the robot can be varied in its personality for customer. The robot is implemneted by “Cognitive Robotic Engine (CRE)” for the dependable integration of human-robot interaction (HRI) components [1][2].