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Nowadays, information exchange becomes popular along with the development of information technology. To protect their confidential information, people usually use steganography because it hides the presence of the secret information in a media file called as cover. In 2018, Desoky et.al. proposed a method namely graphstega or graph steganography that conceals message as data points in a graph. However, this method is vulnerable since the value represented by the graph is not realistic and this will raise suspicion. To overcome the problem, this paper presents a novel approach by exploiting a graph built based on real data as the cover. To securing the position of the secret message, Shamir-s secret sharing scheme is used. The experiment showed that this method has better security than graphstega.