This paper investigates human behavior around an interactive robot at a science museum. To develop a communication robot that works in daily environments, it is important to investigate the available information from a robot about people’s behavior. Such information will enable the robot to predict people’s behavior so that the robot can optimize its interactive behavior. We analyzed visitor behavior toward a simple interactive robot exhibited at a science museum in relation to information from sound level and range sensors. We discovered factors that influence the way people approach, maintain distance, and interact both physically and verbally with the robot. This enabled us to extract meaningful information from the sensory information and apply it to communication robots. Categories and Subject Descriptors H.5.2 [Information Interface and presentation]: User Interfaces– User-centered design, Interaction styles; I.2.9 [Artificial Intelligence]: Robotics General Terms Design, ...