The purpose of this study is to identify the function of marked information structure by analyzing information structure in which referential new information is realized as relational given information. For this purpose, we reviewed the main concepts of information structure, and explained the aspect of realization at the clause level. As a result, it is confirmed that this kind of information structure has the function of ‘securing the flexibility of information structure selection’ and the function of ‘increasing the acceptability of propositional contents by presupposition’. This study is significant in that it newly added the ‘ease of conversion’ as the factor of selecting information structure. In addition, this study not only analyze the realization aspect of the marked information structure, but also deal with the function together, so the theoretical foundation for grammar education about information structure is established.