This book constitutes the refereed proceedings of the 6th IFIP TC 12 International Conference on Intelligent Information Processing, IIP 2010. The 35 revised papers presented together with 4 short papers were selected from more than 50 submissions. They are organized in topical sections on semantic web services, automatic reasoning, case-based reasoning, data mining, web mining, web search, knowledge representation, natural language processing, image processing, and pattern recognition.