Manual ontology construction has proven to be very difficult task and is becoming a problem in the process
of acquiring knowledge for ontology engineer. This article presents a semi-automatic ontological knowledge base construction framework and several aspects of evaluating the semi-automatic ontology generation tool in e-Learning Management System setting. The framework combined an ontology learning tool called Text 2 Onto to construct ontology from scratch and an ontology mapping tool called PROMPT to map the ontology the existing ontology. Experiment on generating ontology from text corpus shows a significant result for knowledge concept extraction.