Sub-ontology extraction provides a solution in dealing with large ontology. As time progresses, new discoveries and new ontology emerges making the ontology data much larger. Updating the sub-extracted ontology becomes a crucial task. Updating extracted sub-ontology can be done by performing the whole extraction process repeatedly from the base ontology. In contrast, our proposed approach is to develop an incremental update mechanism which can minimize the large communication and processing overhead in the former method. In this paper, we construct and describe a grid application service framework for updating extracted sub-ontology using the incremental update mechanism. The service can be accessed through a web portal. Functional verification and analysis provides viability of the framework.