To describe non-manual signals (NMS’s) of Japanese Sign Language (JSL), we have developed the notational system sIGNDEX. The notation describes both JSL words and NMS’s. We specify characteristics of sIGNDEX in detail. We have also made a linguistic corpus that contains 100 JSL utterances. We show how sIGNDEX successfully describes not only manual signs but also NMS’s that appear in the corpus. Using the results of the descriptions, we conducted statistical analyses of NMS’s, which provide us with intriguing facts about frequencies and correlations of NMS’s.