Data mining is the extraction of pattern and knowledge from a large amount of data. This concept can be utilized in various real-life applications. One such congenial application is the online terrorist detection system. With expanding terrorist activities, it has turned out to be essential to control and stop its spread before a specific time. Internet is a noteworthy wellspring of spreading fear based oppression through videos and speeches. They use websites to mentally program people that would move vulnerable individuals to join terrorist associations. So here we propose an effective software to recognize such web properties and ban them naturally for human survival. In present situation utilization of the web is in the blast. Be that as it may, each coin has opposite sides, moreover, the utilization of web is valuable just as hurtful to individual. Late days numerous fear assaults were there on the net. Such fear related exercises are risky for people groups, association, and nations. The fear-based oppressor is utilizing the web to spread dread and structure psychological militant gatherings. By utilizing web they effectively do likewise. To trade data Internet foundation is utilized by various Terrorist cells and they enlist new individuals and supporters. To deal with such circumstance we propose a framework called ATDS.