Cloud computing and smartphone technologies are becoming pervasive in daily life. Cloud robotics, which apply such technologies to robots, is capturing the spotlight as an attractive implementation example. However, when implementing a real time robot service on a wide-range network, it is desirable to grasp the influence of network delay on the robot's actions and the user's experience in advance. Therefore, we propose a simulation environment for Cloud computing robots. This simulation environment replicates the WAN environment between the robot and the Cloud server, and allows the behavior of the Cloud computing robot to be observed in real time. We prototype and evaluate the performance of the proposed simulation environment.