This paper presents in-store customer behavioral model gathered from RFID (Radio Frequency Identification) tags communication data. Although this kind of research has been made by various methods such as interviewing or tracking behind customers, Conventional research methods are made by with the existence of customer tracking research, so far. For collection of natural customer behavior, we made a customer in-store behavior research with RFID tags in a real retail store. In a conventional store design theory, it has been thought that increasing the length of staying time can raise the amount of money per person. Therefore, the store has been designed in the form that goes inside of a shop around. The experimental results suggest that there is a correlation between the spent of time and the length of customer walking path.