The Communication Security and Surveillance Act (CSSA) allows the government to collect the "communications user's information" under certain circumstances (CSSA §§ 11-1I, II and III). However, due to the advancement of new technology, communication & life via the internet has been taking place, an issue arose in several cases: Is "IP Address User's Information" equals to "Communications User's Information"? On that account, this article discusses the potential legal issues as following perspectives: 1. Categorization of possible fundamental rights (right to privacy of correspondence, and information self-determination) related to Communications/IP Address User's Information. 2. The proper approach for the interpretation of CSSA §§ 11-1I, II and III in the light of the above considerations, 3. More specifically, this article provides practical suggestions according to the approach mentioned above.