The Internet of Things is increasingly attracting attention of academic and industry researchers. Information retrieval method helps users to quickly find relevant information from lots of data. However, it requires a new retrieval method considering the characteristics of Internet of Things environment. This paper presents the new retrieval method in Internet of Things environment. Our method adopts the social relationship in Internet of Things. It considers not only relationships between

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... beings but also them between human beings and things, things and things. We propose a levelized tieredthings structure and algorithm based on the social relationship among objects. Our method improves performance of top-k retrieval by adjusting the value of k according to a user's attention level.