Because of the development of information and communications technology, Computer-Ethics education, which is desperately needed emphasizes only necessity, but the real education in school has simply the adverse effect and has fragmentary education to deal with it. For the result, students have a gap between perception and action by not reaching the purpose of Computer-Ethics education which can have a change on the values and attitude. For it, our research with middle school students’ information judges what is right or wrong, but by considering the theoretical basis which can explain the reason of inactive Computer-Ethics action, we try to develop the class model for the class. Therefore, we consider planned behavior theory and study Computer-Ethics class model development by deriving the strategy which reinforces the power of the practice of the incomplete actions in the theory that we know but have not been done.