In recent years, the importance of business continuing planning (BCP) of a building is increasing and in this context, gas engine generators and emergency generators attract attention. However, when introducing such devices, there is no guideline based on the evaluation of introductory merit from the viewpoint of both usual and emergency cases. In this paper, the guideline is proposed based on the simulation result taking account of a disaster risk, device installation cost and a running cost with hotels, hospitals, offices, collected houses as target buildings. The running cost was called for by simulation. The introductory support matrix was created using these results, and the plan for a consumer to introduce a device was shown.