Recently, Internet of Things (IoT) has attracted much attention and smart-grid has become a very important research topic in IoT due to the development of sensors, actuators and wireless network technology. In addition, society focuses on electrical power shortage problem for the earth's environment issue and the aftermath of the great earthquake in Japan. To save energy, there is a concept of smart-home in IoT. Smart-home is a very useful application in IoT to control electronic devices and electric appliances uniformly in residence. Even there are some approaches to save energy in smart homes, there is a lack of effective solutions for saving energy by changing users' habit. Therefore we propose a system for improving the lifestyle habit to save the energy in this paper. This system lets users who live in the smart-home be aware of their life style, wasted electricity, and then improves their lifestyle. The system first detects various information, e.g., position of the user, and energy-usage of home electrical appliances. And then, the system recognizes situation of wasting energy and provide services to improve the lifestyle of users.