In the Area Studies that comprehensively study geography, history, and culture of a certain area, a field study is necessary to improve understanding of the area. In the field study, it is most important to record observations of the researchers in field notes. In general, the contents recorded in the field notes consist of descriptive and reflective information. The information on the field notes mainly includes written materials, sketch materials, and photographs. Despite the fact that these field notes play a very important role in utilizing and sharing the research achievements of Area Studies, the existing field notes written by hand have many problems. There are many difficulties in utilizing and sharing the information of the field notes recorded on paper as well as difficulties due to handwriting. To solve these problems, this paper proposes an electronic field note that runs on the mobile device as an app. The interface and function design for electronic field notes are presented in detail. Also, a server system design for management and utilization of electronic field notes information is presented.