An apparatus and method of searching and visualizing an instance path. The method includes receiving two or more keywords and path search condition; generating a pair of instances with respect to the keywords, extracting a pair of classes corresponding to each of the pairs of instances from ontology instance database; obtaining an ontology schema path with respect to each of the pairs of classes from ontology schema path database; replacing start and end classes with corresponding first and second instances in each of the ontology schema paths and searching for instance path corresponding to the path search condition from the instance paths connected between the first instance and the second instance; outputting instance path display screen on which the searched instance paths are displayed; and if the path search condition changes through the instance path display screen, obtaining and visualizing instance paths corresponding to the changed path search condition.