This book constitutes the refereed proceedings of the International Conference on Intelligent Information Systems, IIS 2013, held in Warsaw, Poland in June 2013. The contributions are organized in topical sections named: Natural language processing, text and Web mining, and machine learning and search.

Natural Language Processing.- A Hybrid Approach for Robust Multilingual Toponym Extraction and Disambiguation.- Towards a Polish LTAG Grammar.- Incorporating Head Recognition Into a CRF Chunker.- Classification of Predicate-Argument Relations in Polish Data.- Online Service for Polish Dependency Parsing and Results Visualisation.- The Scent of Deception: Recognizing Fake Perfume Reviews in Polish.- Question Classification for Polish Question Answering.- Chinese Named Entity Recognition with Conditional Random Fields in the Light of Chinese Characteristics.- Detecting Syntactic Errors in Dependency Treebanks for Morphosyntactically Rich Languages.- A Method for the Computational Representation of Croatian Morphology.- Mapping Named Entities from NKJP Corpus to Składnica Treebank and Polish Wordnet.- Automatic Detection of Annotation Errors in Polish-Language Corpora.- Unsupervised Induction of Persian Semantic Verb Classes Based on Syntactic Information.- Translation- and Projection-Based Unsupervised Coreference Resolution for Polish.- WCCL Match – A Language for Text Annotation.- Diachronic Corpus Based Word Semantic Variation and Change Mining.- A Representation of an Old Polish Dictionary Designed for Practical Applications.- Text and Web Mining.- Related Entity Finding Using Semantic Clustering Based on Wikipedia Categories.- Locality Sensitive Hashing for Similarity Search Using MapReduce on Large Scale Data.- Stabilization of Users Profiling Processed by Metaclustering of Web Pages.- Towards a Keyword-Focused Web Crawler.- Threshold ML-KNN: Statistical Evaluation on Multiple Benchmarks.- Supervised Content Visualization of Scientific Publications: A Case Study on the ArXiv Dataset.- A Calculus for Personalized Pagerank.- Machine Learning and Search.- Finding the Number of Clusters on the Basis of Eigenvectors.- Study on the Estimation of the Bipartite Graph Generator Parameters.- Expected Value of the Optimization Algorithm Outcome.- Solving TravellingSalesman Problem Using Egyptian Vulture Optimization Algorithm – A New Approach.