Along with the rise of e-learning, the importance of enriching teaching materials has increased. Although there are standards such as SCORM (Sharable Content Object Reference Model), teaching materials has not been distributed or shared as widely as expected. The main factors that hinder the enrichment of teaching material include the large burden put on creators of teaching materials that conform to the standards, and the difficulty for users to find suitable teaching materials. In short, standards for promoting the use of teaching materials have hindered both authors and users of teaching materials. In this research, we aim to develop methods to automatically generate a repository of latent teaching materials on the Web. This paper mainly describes the outline of our methods along with the tidy of problems involved in enriching e-learning contents. This paper also describes the experiment of identifying the teaching materials and the effectiveness of our methods are discussed.