A method, an apparatus, and a computer program for detecting network anomaly in a distributed software defined networking (SDN) environment. The method includes collecting a control message from a distributed SDN controller and generating network characteristic information using the control message. The network characteristic information includes statistic information or event information included in the control message, new calculation information calculated using the statistic information or the event information, and network stateful information. The method, the apparatus, and the computer program for detecting network anomaly have high utilization, scalability, availability, and distribution properties to a user by supporting a variety of functions for detecting network anomaly in the SDN environment and providing a high-level API to the user.