In the service platform 2200, the manager function 2201 can correspond to the function of the manager 200 of the system 10 in the example of FIG. 1. Accordingly, the service platform 2200 can be mounted on, for example, the device of the manager 200 described above with reference to FIGS. 2 to 9. Alternatively, the manager function 2201 is mounted on the device of the manager 200 and, on the other hand, the other functions may be mounted on another device such as the server 300 or the like. The device on which the service platform 2200 is mounted may be the same or may differ among the foregoing end user terminals 1100. The element selling and charging function 2207, the user management function 2209, and the element management function 2211 may be mounted on the end user terminal 1100 or may be mounted on other devices to exchange information with the end user terminal 1100, as necessary. Hereinafter, each constituent element will be described.
