His paper presents a monitoring application using Intelligent Space. Intelligent Space (iSpace) is a space in which many intelligent devices, called distributed intelligent network devices (DINDs), are placed to observe the environment. Communicating with individual DINDs enable iSpace to apprehend and understand events in this space and to activate intelligent agents such as mobile robots, computer devices, and digital equipment to provide information and services to users based on observed information. Using the iSpace observation system, we can obtain multiple humans' positions and postures at the same time, even if the humans are in different places in iSpace. Therefore, in this paper we use the iSpace to monitor daily environments with the purpose of home case support. Also, we apply a mobile robot as a tool to deliver monitoring results to users. For designing human-robot communication to achieve continuous and command-free communication between a user and a mobile robot, we present an ethologically inspired human-robot communication model involving several simulations.