In this paper, we proposes a new approach called green behavior generation (GBG), which is designed to reduce the environmental burden without mental stress in daily life. A GBG system consists of sensing, modeling, and service elements. For sensing various kinds of data, a sensor home is constructed. The network system of the sensor home is based on advanced information and communication technology (ICT), such as networked home electric appliances and a ubiquitous sensor network, which are applied to collect energy consumption and context data simultaneously. An experimental example and the usefulness of the sensing environment are shown.