The purpose of this study was to investigate the effectiveness of social network services utilized by Taekwondo gym. The results of the study were collected by collecting opinions about the perception and experience of using the social network service of the research participants selected by the expert group discussion. The functional values of Taekwondo gym leaders' social network services are as follows: convenience of providing information, convenience of exchange of opinions, supplementation of time constraints, and supplement of place constraints. However, social network services that are only used for promoting in an unplanned way have questioned the effectiveness as follows. First, if parents and trainees are not interested, it will not work. Second, without the scarcity of information, the effect falls easily. Third, if you do not respond in real time, the effect is less. Fourth, the Taekwondo gym can be revealed to the people around by the leader's private SNS. Therefore, in order to effectively utilize social network services in Taekwondo gym in the age of rapid change of society due to the development of information and communication technology, it is necessary to unite social network services suitable for characteristics and programs of individual Taekwondo gyms.