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Domain Name System (DNS) is an important system for the Internet communication. DNS is a system for distributed management and operation of domain names, and it is possible to associate with the resources such as IP address, instruct the destination host of the e-mail, and so on. On the one hand, it is very serious problem that the damage caused by the service of the DNS server being stopped, and stable operation of the DNS server is essential for stable operation of the Internet. DNS servers may be illegally accessed to make it target or springboard server for attacks such as Distributed Denial of Service (DDos) attacks and DNS reflector attacks. In this paper, we show the analysis of the queries received by our university DNS server. In addition, we propose the method to suppress attacks to DNS servers by deploying the system to monitor access from DNS clients and adaptively manipulating responses of queries from attackers in front of the DNS server based on the analysis. Moreover, we developed the prototype system and evaluated performance of it.