In a fuel cell system in which load electric power is supplied from a fuel cell and a secondary battery, intermittent operation is performed, that is, operation of the fuel cell is stopped and the load electric power is supplied from the secondary battery in a low load region. Employing the encoding and decoding technique facilitates providing a great number of channels of communication in a unit volume while preventing unwanted cross-talk between the communication channels. In this manner, for example, when all the image recording file is displayed in a list, the use state of each picture recording file is acquired from the property file, making it possible to clearly present a user with a use state such as Not reproduced or Reproduced. To this end, the conductive body is produced from a material exhibiting higher conductivity, by means of noncutting deformation, and is connected to the surrounding insulating body to form a composite body. The gateway selects at least one of the clouds according to predefined Service Level Agreement information, and stores content provided from the user device to the selected cloud. These mechanisms and methods for such synchronousasynchronous process selection can enable embodiments to determine forecasts for multiple users over an arbitrary time interval.