We live in information-oriented society. In political part, We are confronting E-Democracy, and In non-governmental section, We are confronting many dangers of privacy' violation. Specially In cyberspace, privacy' violation happened in many cases. Of course before information-oriented society, privacy' violation happened but after information-oriented society, privacy' violation happened more frequently than before. So the need to protect privacy in cyberspace became more urgent than before. Privacy' violation happened because of demand of imformation, freedom of expression, the surveillance of nation and non-governmental section. In this thesis, I analyzed the many causes and effects of privacy' violation. And then, I tried to find the effective method to protect privacy and relieve privacy' violation. I treated the effective method in the point of legislation, censorship of governmental section and non-governmental section, judicial relief considering imformation gap. IN korean constitutional law, Article 10, and 37, We can find that korean constitutional Law claim to stand for personalism, not rugged individualism and totalitarianism. So absolute protection of privacy is not permitted. In conclusion, privacy must harmonize with the social public interest. IN this thesis, I tried to focus on active and functional theory of privacy, not stationary theory. We live in information-oriented society. In political part, We are confronting E-Democracy, and In non-governmental section, We are confronting many dangers of privacy` violation. Specially In cyberspace, privacy` violation happened in many cases. Of course before information-oriented society, privacy` violation happened but after information-oriented society, privacy` violation happened more frequently than before. So the need to protect privacy in cyberspace became more urgent than before. Privacy` violation happened because of demand of imformation, freedom of expression, the surveillance of nation and non-governmental section. In this thesis, I analyzed the many causes and effects of privacy` violation. And then, I tried to find the effective method to protect privacy and relieve privacy` violation. I treated the effective method in the point of legislation, censorship of governmental section and non-governmental section, judicial relief considering imformation gap. IN korean constitutional law, Article 10, and 37, We can find that korean constitutional Law claim to stand for personalism, not rugged individualism and totalitarianism. So absolute protection of privacy is not permitted. In conclusion, privacy must harmonize with the social public interest. IN this thesis, I tried to focus on active and functional theory of privacy, not stationary theory.