In this paper we introduce the application system based on the domain specific ontology. Some design problems of the ontology are discussed. The ontology is based on the WordNet's database and consists of Turkish and English terms on computer science and informatics. Second we present the method for determining a set of words, which are related to a given concept and computing the degree of semantic relatedness between them. The presented method has been used for semantic searching process, which is carried out by our application.