A knowledge graph generating apparatus, method and computer program product thereof are provided. The apparatus marks an entity-relationship of the template product information in the template webpage and generates a capture rule set according to the operating signal, wherein the template webpage is one of multiple product webpages, and the template webpage has a pattern format. The apparatus extracts a plurality of first product information of the first product webpages according to the capture rule set, wherein the first product webpages have the template format, and the first product webpages are selected from the product webpages. The apparatus generates a product information classification result through a product information classification model, wherein the product information classification model is generated based on the entity-relationship of the first product information and the entity-relationship of the template product information. The apparatus converts the product information classification result into several semantic triples to generate a knowledge graph.