The communication unit 12 receives, via the service control device 20, information relating to a transmittable data amount determined in the application server 30. Information relating to a transmittable data amount may be, for example, a rate quota, a byte quota, rate control, or a charging policy. Alternatively, information relating to a transmittable data amount may include more than one of a rate quota, a byte quota, rate control, or a charging policy. A rate quota, a byte quota, and rate control are information indicating a data amount transmittable by the communication terminal 50 in a predetermined period, or information indicating the number of messages for transferring data. Moreover, a rate quota, a byte quota, and rate control may include a data amount receivable by the communication terminal 50 in a predetermined period, or information relating to the number of messages for receiving data. A predetermined period may be, for example, one month, one week, one day, one hour, or the like. A rate quota and a byte quota may be each represented as an APN rate. A charging policy may be information relating to a remaining transmittable data amount when the communication terminal 50 is a prepaid-compatible terminal, and an upper limit value of a transmittable data amount is determined. Moreover, uplink data, downlink data, and a rated value specific to each piece of information may be set for a rate quota, a byte quota, and rate control. Uplink data are data transferred from the communication terminal 50 toward the application server 30. Downlink data are data transferred from the application server 30 toward the communication terminal 50. Hereinafter, four pieces of information including a rate quota for uplink data, a rate quota for downlink data, a byte quota for uplink data, and a byte quota for downlink data may be collectively represented as a quota. Note that information relating to a transmittable data amount may include a tariff. The tariff may include information relating to a transmittable data amount, the number of transmittable messages, a receivable data amount, or the number of receivable messages.