This book constitutes the refereed proceedings of the Second Asia Information Retrieval Symposium, AIRS 2005, held in Jeju Island, Korea, in October 2005.

The 32 revised full papers and 36 revised poster papers presented were carefully reviewed and selected from 136 papers submitted. All current issues in information retrieval are addressed: applications, systems, technologies and theoretical aspects of information retrieval in text, audio, image, video and multi-media data. The papers are organized in topical sections on relevance/retrieval models, multimedia IR, natural language processing in IR, enabling technology, Web IR, question answering, document/query models, a special session: digital photo album, TDT/clustering, multimedia/classification, and two poster and demo sessions.