At the Art Research Center (ARC) of Ritsumeikan University, with the preservation and analysis of intangible cultural properties as our primary research topic, we are undertaking digital archiving of various materials and data associated with dance and theater arts. As for the preservation of body motion in dance, while preserving already recorded images as a film archive, we are also undertaking video recordings of traditional theater, especially multiple angle video recording that uses multiple video cameras simultaneously. Furthermore, we have installed an optical-type motion capture system in 2000 and are examining its possibilities for use in archiving and analysis of dance movements