Since an inflow of the Western architectural style into Korea in late 19th century, the new terms were created because the people needed to represent the new architectural style. After that, changes of the terms were happened and there were the influences of various factors. Before Western architectural styles flow into Korea, the embassy to China and Japan firstly observed the architectures of Western style and recorded abstractly as a compound word. The terms have become concrete since the architectures of Western style is constructed in Korea and the people had a experience to observe that directly. The terms were changed in way to represent concretely with a use of the construction materials and the external appearances. This changes were concerned with not only the influence of the Western architectural style but also the influence of Chinese architectural style and Japanese architectural style. As a result of this study, it is clarified that changes of the architectures in late 19th century were related with the influence of China and Japan not only the Western influence through changes of architectural terms.