We propose a human interface for a smartphone application. The application is an evacuation support system that recommends safe evacuation routes when a natural disaster occurs. In a large-scale disaster occurs, the Internet communication may be difficult due to communication congestion and break down of communication base station. Since our system consists of only smartphones and communicate with each other using ad hoc network without depending on the communication base station, our system is free from the above problems. Evacuees share information by using multi-agent system among them. The main purpose of the evacuation support system is to guide its owner even in a panic situation. Therefore, our system’s user interface must be simple. The proposed design consists of the main screen, agent management screen that configures agents, and the guidance screen that display an evacuation route. In this paper, we present the human interface and the background philosophy of the system.