This paper is to map information structure into syntax structure by analysing Korean cleft sentences namely, 'Kesun' and 'Kinun' cleft sentence. The derivation of Korean cleft sentences is analyzed with two main ways, base generation and movement analysis. This paper insists that first, ‘Kesun’ cleft is the division by Topic and Identificational Focus and ‘Kinun’ cleft is the division by Contrastive Topic and Informational Focus. Second, basic syntactic function of the two cleft sentences in Korean is movement. and to support this movement, several functional categories are inserted, namely, a nominalizer ‘-n kes’ and ‘ki’, and Functional verb ‘-ida’. And the last, a basic tree diagram for Korean language is like the following. This tree diagram above shows that on the ground that ‘–n kes’ can accommodate tense and auxiliaries, Topic Phrase is located above ModP and because ‘-ki’ can accommodate Aspect and Root Verb, Contrastive Topic Phrase is located above AspP and under TP. Information structure believed to be located above syntactic structure can be clearly shown with this diagram and this can be applied to analyze not only cleft sentence but also information structrure related phenomena in korean language and even more to, hopefully, Indo-Eropean cleft setences.
