A restriction control apparatus configured to perform restriction control of communication of a user apparatus in a mobile communication system, comprising: an information obtaining unit configured to obtain, from a user information management apparatus in the mobile communication system, group identification information indicating, in a plurality of Machine-Type-Communication, MTC, groups, a group to which the user apparatus belongs, wherein each of the plurality of MTC groups is provided with a priority; and a restriction determination unit configured, when receiving a communication request from the user apparatus, to determine whether the group to which the user apparatus belongs is a control target or not based on the group identification information and group identification information of a control target determined by the restriction control apparatus, wherein the restriction control apparatus includes a user information storage unit configured to store group identification information and user identification information by associating them with each other, and wherein the restriction determination unit is configured to obtain the group identification information from the user information storage unit based on user identification information included in the communication request, and to determine whether the group to which the user apparatus belongs is a control target or not based on the group identification information and group identification information of a control target determined by the restriction control apparatus, and wherein the restriction control apparatus comprises: a communication request processing unit configured, when the group to which the user apparatus belongs is determined to be a control target by the restriction determination unit, to reject the communication request according to a ratio of rejection associated with the priority of the group to which the user apparatus belongs, wherein the ratio of rejection is 100% for a group of low priority, and the ratio of rejection is decreased for a group of high priority. an information obtaining unit configured to obtain, from a user information management apparatus in the mobile communication system, group identification information indicating, in a plurality of Machine-Type-Communication, MTC, groups, a group to which the user apparatus belongs, wherein each of the plurality of MTC groups is provided with a priority; and a restriction determination unit configured, when receiving a communication request from the user apparatus, to determine whether the group to which the user apparatus belongs is a control target or not based on the group identification information and group identification information of a control target determined by the restriction control apparatus, wherein the restriction control apparatus includes a user information storage unit configured to store group identification information and user identification information by associating them with each other, and wherein the restriction determination unit is configured to obtain the group identification information from the user information storage unit based on user identification information included in the communication request, and to determine whether the group to which the user apparatus belongs is a control target or not based on the group identification information and group identification information of a control target determined by the restriction control apparatus, and wherein the restriction control apparatus comprises: a communication request processing unit configured, when the group to which the user apparatus belongs is determined to be a control target by the restriction determination unit, to reject the communication request according to a ratio of rejection associated with the priority of the group to which the user apparatus belongs, wherein the ratio of rejection is 100% for a group of low priority, and the ratio of rejection is decreased for a group of high priority. a communication request processing unit configured, when the group to which the user apparatus belongs is determined to be a control target by the restriction determination unit, to reject the communication request according to a ratio of rejection associated with the priority of the group to which the user apparatus belongs, wherein the ratio of rejection is 100% for a group of low priority, and the ratio of rejection is decreased for a group of high priority.