This paper aims to examine the implications of Martin Buber's relationship- oriented existentialist philosophy for unification education. To do this, firstly, this paper looks at the relationship theory and the theory of in-between existence as a relational human view of Buber. Secondly, this paper examines ‘I-You’ and ‘I-It’ as two types of relationship and peace building based on monologue and dialogue. Finally, this paper studies the meaning of Buber's philosophy for unification education and proposes several implications. First, we have to look at unification as a matter of human and human life. Second, unification education should be oriented toward ‘I-You' relationship, not ‘I-It’ relationship. Third, we should have a true dialogue in the dialogue of the deaf for peace. Fourth, we should pursue Yìzhōngqiútóng(異中求同) dialogue as a positive Héérbùtóng(和而不同) based on the respect for the difference of others. Finally, it is suggested that for the sake of peace and unification between North and South Korea, bilateral cooperation should be achieved with I-You relationship-oriented communication, while international cooperation should be considered as being mainly driven by I-It relationship-oriented communication.