The paper presents an approach to ontology population as operations with Scott information sys tem. The deducibility relation in the ontology population information system corresponds to rules of input data processing and ontology population. To implement an ontology population process, we suggest a multi agent approach based on natural language semantic analysis. In the proposed multi agent model, agents of the following two types interact: information agents corresponding to meaningful units of the information being retrieved and rule agents implementing population rules of the given ontology based on the semanticsyntactic model of the language.