This study was conducted to derive the information activity development plan of the Korea Coast Guard, a maritime counter-terrorism agency under the Anti-Terrorism Act , in relation to information activity, which can be said to be the most important factor in maritime counter-terrorism activities. By reviewing the relevant laws regulating maritime counter-terrorism information activities, the legislative gap was identified, and by comparatively researching maritime counter-terrorism information activities of advanced maritime countries such as the United States, Canada, and Japan, and deriving implications, the development of counter-terrorism information activities of the Korea Coast Guard referenced in the room. In advanced maritime countries, the Coast Guard are given the authority to collect information as a national security agency and a member of the national intelligence community, and play a pivotal role in counter-terrorism at sea. This foreign system proves that although the Korean Coast Guard is a counter-terrorism agency in name and reality under the Anti-Terrorism Act , the corresponding legal authority is relatively weak. In this study, emphasizing that in order to normally carry out the maritime terrorism prevention responsibilities assigned to the Coast Guard, the authority to collect information in all areas related to the sea must be secured, focusing on maritime counterterrorism information collection and information sharing.