This paper presents the performance validation of the motion control system for integration force and trajectory information. To realize the implementation high-quality motion that includes contact and non-contact motion to robot system, two contradictory systems; force and trajectory control should be synthesized in one control axis. In order to respond to the request, we proposed a motion synthesis system which integrates two controller in frequency domain. This paper firstly will discuss the acceleration control based force control and position control respectively. And it is also shown that the force reproducibility is decided by contact object's impedance. Then, performance analysis of the motion synthesis system will be shown. From the results, it is confirmed that the motion synthesis system satisfies two control goals without depending on impedance or presence of contact environment. The validity of the design approach is verified by experimental results.