The purposes of this study are to analyze the structure of the division and its operation related to bibliographic control in national libraries and to propose several ways to strengthen its functions of National Library of Korea based upon the analysis. Literature reviews were carried for the definitions and roles of national libraries and their bibliographic control. The divisions of bibliographic control in Library of Congress, British Library, National Diet Library of Japan, the Royal Library of Denmark, and National Library of Korea were analyzed. Three methods for strengthening bibliographic control in National Library of Korea were suggested as follows: first of all, need of establishment of independent bibliographic control center, secondly, high quality of bibliographic data and collaboration with related institutions, and third, strengthening of research in the future of bibliographic control.