This paper began with the premise that motivation for visiting museums is a key factor that influences the effectiveness of interpretative media. Visitors motivations for visiting museums and their level of attention towards three interpretative media used at the National Museum of Korea panel exhibits, touch-screens, and films -- were studied. Results of this survey proved that motivations for visiting museum are related to the effectiveness of the interpretative media, and the degree of influence differ according to the types of visiting motivations. In particular, while the learning-motivated groups were more likely to attend panel exhibits, leisure-motivated groups were more likely to attend films. The findings indicate that the effectiveness of the interpretative media is the result of an interaction between the types of visitor motivations and the interpretative media under study.