Since the mid-1990s, Internet business has flourished around the world. Nowadays, many companies come to focus their attention on effectiveness of communication with diverse stakeholders using information and communication technology (ICT). Rapid development and permeation of the Internet allowed people to use the interactive media for non-business purposes in a convenient and comfortable manner. However, due to the widespread availability of ICT, the classic and new crimes of "cyberstalking" are reported very often. The versatility of the Internet technology has made it possible that new forms of cyberstalking are developed beyond traditional stalking. This paper examines how ICT transforms traditional stalking, and what characteristics cyberstalking has, focusing on gender and ICT in the first place. Furthermore, we also examine how ICT obfuscates the boundary between real space and cyber space. Hence, because social norms in real space can function as "social reality" imprinting people with specific norms, online communities have a certain kind of influence on people's formation of social norms.