Humans have evolved to walk upright since a million years ago. However, as an industrial society entered, seating and working hours became abnormally high only a few decades ago. This has caused the human body to be badly affected. According to the preceding medical studies, the environment of sitting and working for a long time negatively affected adult diseases. In modern society, people are doing long-again tasks such as sitting in one place or standing up. This has many side effects on the human body. This is because humans have evolved in a moving direction. Reflecting this background, the study adds evolutionary biological perspective to think about working in a walking environment as well as standing desk working environment. It also expected expansion of the mobile office environment where smartphones, a type of smart work, are used directly in the field. To do so, it is going to carry out an experiment that does work with Smartphones. The study could help build and establish a mobile office environment, a type of smart work. In addition, a working environment for walking around as well as using smartphones could be developed. Furthermore, the work environment and the study environment of students could change.