The growing demand for a Semantic Web is focusing attention on Semantic Web trials that use a huge relational database (RDB), which is the backbone of IT. The resource description framework (RDF) is a language system that enables the information of resources on the Web to be written clearly and logically. Correct writing and use of the RDF are the core of the Semantic Web. It is possible to build a Semantic Web without RDB intervention. However, the use of an existing RDB data requires automatic transformation of RDB data into an RDF statement. This paper proposes an interoperable data model called a Relational between RDF interoperable data model (R2iDM), which can generate an RDF statement with table data and Structured Query Language without having to read the meta-information of an RDB table. With the R2iDM, there is a reduction in the peripheral attributes (but not the primary attributes) as well as the necessary attributes for RDF transformation. In short, the R 2iDM is a very simplified data model for interoperability between a relational data model and the RDF. The paper also shows how R2iDM is mapped to the RDF. The mapping method is more advanced than existing simple methods of mapping between an RDB and the RDF.