Abstract-This research aims at studying the data mining role in semantic web data. Semantic web is popular in a variety of different applications, but research in data mining in semantic web data, appears less. As open source software for data mining in semantic web open source is minimal, and data model of the semantic web requires RDF or OWL format. These specific formats cannot be used directly in most data mining tools. We thus propose a methodology to mine data that appear in an RDF format. The mining process has been demonstrated through the use of R packages.Index Terms-Data mining, semantic web, R language. I. INTRODUCTIONCurrent data is not stored on a single computer, because the current is the era of information technology and social media, data can be stored in many computers on the internet, is difficult for them to access data quickly and easily. The researchers presented the technology to help manage these data called semantic web. The data in the format or the same specification as RDF/XML, N3, Turtle, N-Triples and OWL.Semantic web [1], [2] has been used in various fields such as Information Systems, Search Engine etc. Large data technology to handle with this is data mining, because the large data analyzed find patterns or relationships of data is an advantage of data mining. Research in the field of data mining in semantic web data is not yet widely, since there is a management tool for data mining of semantic web is less, and data from the semantic web is stored in a format that cannot be used directly in data mining. The research in data mining has appeared very little.Research in the field of data mining in semantic web data applied to various algorithms of data mining, such as data classification, association rule mining etc. Most research using the licensed software such as Microsoft Data Mining Extension (DMX) which is Microsoft SQL Server.From the above it can be seen that the present data are not stored on a single computer always, is difficult to put that information in the internet is analyzed find patterns or relationships with the data mining. This research has proposed methods for data mining in semantic web data. II. BACKGROUNDA. Semantic Web Semantic web, have been developed since the storage is Manuscript received December 13, 2013; revised March 14, 2014. This work was supported in part by grant from Suranaree University of Technology through the funding of Data Engineering Research Unit.The authors are with the School of Computer Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand (e-mail: chomboon.k@gmail.com).only human to understand the meaning, but the machine cannot understand it, because data without structure. Semantic web has been developed to provide useful data on the Internet that can be analyzed and applied to various tasks. The language used for defining the data structure is RDF The standardization for semantic web in the context of web 3.0 shows in Fig. 2. The components of semantic web are as follows:  XML stands for Extensible ...