Due to the interest by public audience and academic research, there has been a great interest in Terrorist Networks by the academicians, analysts and criminologists. Either to learn how to disrupt or to prevent their activities, structure of these networks are investigated. The final conclusion about their structure and topology came to the fact that they do not resemble each other, but there are categories of them. In this paper, we categorized these networks into six because of their ideologies and common practices. Topologies of these six categories are observed and importance of key players (leaders, financiers, propaganda units and armed units) are compared based on these categories.