The HSS 120 manages subscriber information (UE subscription information, a UE usage type, or the like) relating to the UE 60. The HSS 120 connects to the MME 100 and the SCEF 110.

The AS 130 determines a transmittable data amount relating to the UE 60, specifically, at least one of a quota, rate control, and a charging policy. The AS 130 determines at least one of a quota, rate control, and a charging policy for each UE. Note that a service capability server (SCS) may be used instead of the AS, and the servers may be referred to as an SCS/AS. The AS 130 transmits the determined transmittable data amount to the MME 100 via the SCEF 110. Note that the AS 130 (or the SCS) may determine a tariff, and transmit the tariff to the MME 100 via the SCEF 110.

Now, flow of processing of sending information relating to a transmission data amount according to Example Embodiment 2 is described by using FIG. 3. First, the AS 130 determines, as a parameter relating to the UE 60, at least one of a quota, rate control, and a charging policy (S11). Note that the AS 130 may determine a tariff.

Next, the AS 130 transmits, to the SCEF 110, a set chargeable party request message in which the parameter determined in step S11 is set (S12). Specifically, a quota, rate control, and a charging policy may be set in the set chargeable party request message as a CP parameter. Rate control in this case is data control suggested by the AS 130 on a core network. Herein, an example of a CP parameter is described by using FIG. 4. Note that, when the AS 130 determines a tariff, the tariff may be set in the set chargeable party request message.