With the emergence of several serious social problems due to the internet, the need to enhance cyber ethics norms and values is increasing. Furthermore, instead of remaining at the superficial level of learning moral principles, active ethical decisions are emphasized to enable youth to critically understand problems and express their thoughts independently. In response to this need, this study developed a cyber ethics group education program focusing on ethical decisions. To create a program that would be suitable for early adolescence, the program was planned, modified, and reorganized following the program development procedure. We also verified the effectiveness of the program. The research results were as follows. The effectiveness assessment found that the difference by measurement period was significant, and it was confirmed that the cyber ethical awareness of participating adolescents improved by an average of 8.1% after completing the program. Additionally, the subfactors of cyber ethical awareness indicated a significant change according to the measurement period in terms of responsibility and knowledge. Finally, the results of the sub-scale showed a significant improvement in the perception of responsibility and knowledge of the use and ethics of knowledge in relation to time. From these results, suggestions for cyber ethics education for early adolescents were developed.