The user device, the server, the upgrade service system, downloading the upgrade

摘要

A wireless apparatus or the like downloads upgrade content information and an upgrade key generated from a production number of the user apparatus which are generated by an upgrade key support center apparatus to perform upgrading, and the upgrade key support center apparatus periodically acquires apparatus information of the wireless apparatus or the like to monitor whether illegal upgrading is not performed. This makes it possible to easily manage a wireless apparatus which can perform an increase/decrease in capacity, selection of redundancy, change of functions, and the like by using an upgrade key.