Electronic government provides different interactions between government and citizens, government agencies, employees and businesses or commerce. All these interactions provide better, faster and safer use of government services. In today's world, electronic government services have one very important role and that is war against terrorism. In this context, terrorism implies traditional and cyber terrorism. Network connections between different government services, use of databases with registered terrorists and terrorist organizations, electronic monitoring and checking of individual on the borders or suspicious web sites can prevent future attacks. This paper summarizes and presents different use of government electronic service in the war against terrorism through technical and legal observation. Besides advantages and disadvantages of the current electronic services, the paper presents ideas for possible improvements and better law support.