This study was conducted with the aim of responding to cyberbullying, a new type of school violence that has recently emerged. To this end, the relationship between overuse of smart media and cyberbullying among middle school students was examined and the community spirit was verified. This will provide an empirical basis for devising social welfare intervention measures to prevent and mediate cyberbullying among middle school students. In order to carry out the research, 911 middle school students attending middle school were surveyed and the research problems were analyzed by using the Interaction Program of SPSS and Daniel Soper. The main findings of this study are as follows. First, the use of smart media by middle school students has been shown to have a positive(+) effect on cyberbullying. Second, community spirit has been shown to have a negative(-) effect on cyberbullying. Third, community spirit has been confirmed to have a regulation effect in alleviating cyberbullying in the relationship between overuse of smart media by middle school students and cyberbullying. Specifically, groups with a high sense of community appeared to be protected from cyberbullying even if they use smart media, while groups with low sense of community appeared to be vulnerable. Based on these findings, social welfare intervention measures were proposed to prevent and reduce cyberbullying among middle school students.