The purpose of this study is that there are meaningful differences between experiment group and control group. The experiment group had classes by the method of the Social networking program "Facebook". Otherwise, the control group had by the oral lecture in the class room. It was morphologic vocabularies for these two groups have class to enhance their English skills. Two groups were almost freshmen(46 & 44 students) in the course of Practical English. The course was run with morphologic words, especially Anglo-Saxon, Latin and Greek prefixes. For the proper result, we designed the 16 weeks programs with the social network program(Facebook) to experiment group and with paper materials to control group. The results of this study are showing that experiment group gets higher scores than control group with vocabulary test after class. Also, experiment group has shown advanced results over control group to almost every survey inquiries. The statistical analyses for those inquiries are run by t-test, x2 and p test. In conclusion, this study results suggest that using social networking interface(e.g. Facebook) for students who need to learn morphological English words are proper method.