As mobile communication technology grows, the use of social network services(SNS) is becoming common and common. Although SNS provides an attractive means of interaction and communication among users, the seriousness of personal information privacy problems is emphasized in relation to the use of SNS. The information that SNS users disclose is very personal and can be seriously compromised if misused by a third party. Therefore, considering the environmental characteristics of SNS, the depth of user information, and the level of disclosure, there is a need to consider the privacy problem in SNS as another dimension. The purpose of this study is to investigate the process of self-disclosure behavior, which is a core activity of SNS, from the information privacy concern to SNS users, and to show the relationship between perceived risk, perceived benefit, perceived value, and privacy experience. We also introduced privacy paradox and privacy calculation theory to deal with privacy problem in SNS. And users try to expand interpersonal relationships by strategically performing selfdisclosure to become an influential user in SNS. Self-disclosure, which is one of the main constructs of this study, is a result of information privacy concerns and is the act of disclosing personal information to other. Since the SNS environment does not have the same physical space of users for communication, the degree of self-disclosure in the SNS is a major opportunity to build trust in interpersonal relationships. Most SNS users tend to be very active in self-disclosure behavior, even though they are concerned that privacy may be violated. We examined the relationship between information privacy concerns and self-disclosure behavior and examined where there is a privacy paradox between the two constructs. We have introduced the theory of privacy calculation to explain the self-disclosure behavior of SNS users, and examined the relationship between the risk, benefit, and value that users feel through the use of SNS. And the role was explored by introducing a privacy experience as a factor that could increase privacy concerns and risks for individuals. And the role was explored by introducing the privacy experience as a factor that could increase personal information privacy concern and risks, and the moderate effect between perceived value and self-disclosure was also considered. Based on a survey of 325 SNS users, we analyzed the structural equation modeling method and used AMOS 23 as a tool. The results show that there is a privacy paradox between information privacy concern and self-disclosure behavior on SNS users. Also, based on the theory of privacy calculation, it is confirmed that the self-disclosure of the user in the SNS is due to the relatively large utility value obtained by using the SNS. And the privacy experience has a significant effect on information privacy concern and perceived risk, but the moderate effect between perceived value and self-disclosure behavior could not be confirmed. In this study, we have identified the relationship between information privacy concerns, risk, benefits, value, and privacy experience and self-disclosure behavior in SNS. Based on the results of the study, we presented the problems to be considered by the various stakeholders involved in the SNS ecosystem in relation to information security.