One of the most important factors in determining the quality of living environment is daylighting. Especially its influence on the psychological and biological life of human beings cannot be underestimated. Therefore, lots of researches have been done in order to develop a more efficient daylighting system. The sunlighting system, one of many developed systems, has been developed and applied in various ways. However, the high installation cost of sunlighting system has been the most difficult stumbling-block in making it commercial. However, as domestic apartment houses tend to be more luxury, life environment, in building apartment hose, becomes a very important factor more than cost. Therefore, it would be possible to adopt sunlighting system in the non-window areas such as a restroom in an apartment house. This research is a preliminary work in order to measure a possibility of applying sunlighting system in an apartment house. In order to do so, I measure Light Factor in various areas of apartment house. As a result, in case of a residential-commercial building, areas such as kitchen, restroom, and entrance are relatively weak-lighting areas. In case of a traditional apartment house, restroom and entrance are relatively weak-lighting areas. For that reason, a special lighting support is needed in these areas.