The purpose of this study was to provide implications for competency development of pre-service teachers and to find suggestions for improvement in pre-service teacher programs, by analyzing the differences of pre-service teachers' perception of the Technology, Pedagogy, and Content Knowledge (TPACK). To conduct this study, TPACK survey instrument was translated into Korean. Data from 87 participants were used for the final analysis after eliminating six that were incomplete. The paired t-test was conducted to analyze the differences between importance-performance of pre-service teachers’ perception of Technology, Pedagogy, and Content Knowledge (TPACK), and an analytical framework was used for the Importance-Performance Analysis (IPA). The result of paired t-test revealed that seven categories and 28 sub-categories induced pre-service teachers' different perception with the significance level of .05. Also, the IPA analysis showed that there was one category (PK) and five sub-categories (CK03, PK03, PK04, PK07, TPK07) that had high importance and low performance, and needed more endeavor and concentration.