This paper describes our project on digital archiving of intangible cultural properties such as dance and other performing arts. We employ a commercial optical-type motion capture system for measuring accurate human body motion during dance. The acquired data have been stored for preserving precious intangible cultural properties for the future generation as well as processing human body motion by both quantitative and qualitative approaches. Processing includes retrieval and indexing of captured data, and recognition of motion. A topic of CG restoration and reproduction of a Japanese historical Noh stage and Noh plays, which can be applied to the preparation of edutainment materials, is also described.