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Web search services serve as a gateway for users to use the Internet and generally provide various information service contents such as news and music contents. The characteristics of web search services is that web search service providers with a large market share in the end user market may be able to maintain a high level of market dominance in other markets due to the external influence of indirect networks. As a result, in the web search service market, market dominance in the search market occurs frequently in the internet shopping market, and competition is restricted. In this case, there is a problem of how to define the market and competition restriction. This paper examines the market definition and market dominance of the web search service market based on the OECD report.
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