These days, home appliances in our living environment are becoming full of functions. On the other hand, the increase of their functions makes their operation complicated. Therefore, an intelligent room which recognizes gestures and support operators is required in various places. In this paper, we construct a gesture recognition system that considers an operator's posture using a range image sensor. The proposed system uses Support Vector Machine (SVM) to recognize gestures. Several experiments are performed to demonstrate the effectiveness of the proposed method.