It is widely believed that linguistic theories and information technology have considerably influenced foreign language education. However, the collaboration of these three domains has not brought about new scientific results. It it thus, our attempt to realize an integration of theoretical and applied linguistics on the basis of computer sciences, and establish a new synthetic field called "Linguistic Informatics." The present volume constitutes the Proceedings of the First International Conference on Linguistic Informatics held at Tokyo University of Foreign Studies (TUFS) in December 2003. The volume is comprised of five chapters. 1. Computer-Assisted Linguistics: Potential for collaboration between linguistics and informatics. 2. Corpus Linguistics : Status report on corpus-based linguistic research. 3. Applied Linguistics : Relationship between second language acquisition and linguistic theory. 4. Discourse Analysis and Language Teaching : Current status of natural dialogue-based discourse analysis. 5. TUFS Language Modules : Development of multilingual e-learning materials covering 17 different languages.