This edited book contains articles accepted for presentation during The Intelligent Information Processing and Web Mining Conference IIS: IIP WM'04 held in Zakopane, Poland, on May 17-20, 2004. Considerable attention is devoted to the newest developments in the area of Artificial Intelligence with special calls for contributions on Web mining. This book will be a valuable source for further research in the fields of data mining, intelligent information processing, machine learning, computational linguistics, or natural language processing for search engines.