A device management technique wherein management objects with device capability information are created and used for each feature domain or application. An aerosol container having a liquid storage part in a passage from the interior of the container body to a nozzle of an aerosol valve system and a valve shut out the liquid storage part from the interior of the container body with spraying operation. The common electrode is formed to cover at least part of the seat. A back wheel is supported for rotation at the back end of each of the bottom parts. The data mining tool has a model building system based on at least one SQL query and training data, and a scoring system based on SQL queries.