Rule acquisition is as essential as ontology acquisition, even though rule acquisition is still a bottleneck in the deployment of rule-based systems. This is time consuming and laborious, because it requires knowledge experts as well as domain experts, and there are communication problems between them. However, sometimes rules have already been implied in Web pages, and it is possible to acquire them from Web pages in the same manner as ontology learning. Inferential rules are as essential to the Semantic Web applications as ontology. Therefore, rule acquisition is also an important issue, and the Web that implies inferential rules can be a major source of rule acquisition. We expect that it will be easier to acquire rules from a site by using similar rules of other sites in the same domain rather than starting from scratch. We proposed a rule acquisition procedure that automates repeated rule acquisition from similar sites by using the rule ontology RuleToOnto. We proposed two main steps of rule acquisition, which consists of rule component identification and rule composition with the identified rule components.