In recent announcement, the number of households with elderly people becomes 16.4 million, and occupies 1/3 of the numbers of all households. Moreover, increease rates of the number of households of elderly pepole living alone are remarkable in five yeras with 38.8%. Therefore, the system which can monitor the living status of them is desired. From such background, we propose the system which can monitor the living status of elderly people living alone from the use situation of plural home electric appliances. This system can detect a use situation of them, without remodeling the existing home appliances. The result of the field experiment, it was possible to monitor the living status accurately from the use situation of plural home electric appliances.