We present a method for effective navigation in structure of large information spaces. The method employs incremental browsing of the information space structure and visualizes in every moment only specific part of the space (a window) where its content is selected adaptively according to evaluations of the presented entities. Entity evaluations are gained from interactions with entities (manual browsing of people or automatic browsing by applications). We describe proposed method in the context of ontology structure navigation. Categories and Subject Descriptors: H.5.4 [Information Systems]: Hypertext/ Hypermedia--Navigation General Terms: Algorithms, Design, Experimentation