Until now, our country doesn't have first hand experience about damage caused by volcanic eruption. So if Mt. Baekdu explode on a big scale, unprepared people will be damaged a lot. In order to reduce damage, we should anticipate explosion for prompt information delivery and disaster prevention education through precursor of eruption. We should develop abilities to handle the situation without any confusion with practical system of reaction which is suitable for our country. Therefore, we decided to inquire into the applicability of reaction system, investigating and comparing the role, duty, and reaction system of Japan, America, and Indonesia where volcanic eruption occurs frequently unlike our country. According to the result of research, the biggest problem of our country's volcanic eruption is about the reaction system for natural disaster. Our country detects disaster, and announce it too late. And efficient prevention effect can't be seen as there are no proper policy and manual because there is no volcano experts.