This lecture aims to help explaining and understanding the structure of international order and issues in international public sphere. The key concept for this understanding is globalization. Globalization of market, technology and international security closely knitting up states and actors to global arena, while political structure is geographically divided into 200-some sovereign states. Only these states have legitimate foundation of power to exercise its military, economic and legal capacities. The inconsistency between single global arena and locally divided political authorities requires new concepts and methodologies for analyzing international order under globalization.