A User Equipment, UE, comprising: a transmission and reception unit and a control unit, wherein the transmission and reception unit is configured to: in a registration procedure, transmit a Registration request message including Single Network Slice Selection Assistance information, S-NSSAI, to an Access and Mobility Management Function, AMF; and receive a response message to the Registration request message from the AMF, the response message including first identification information, or second identification information, the first identification information indicating that the S-NSSAI is not allowed in a current Public Land Mobile Network, PLMN, and the second identification information indicating that the S-NSSAI is not allowed in a current registration area, in a registration procedure after the reception of the response message including the first identification information, the control unit is configured to determine not to include the S-NSSAI in a Registration request message in the current PLMN, and the transmission and reception unit is configured to transmit the Registration request message that does not include the S-NSSAI, and in a registration procedure after the reception of the response message including the second identification information, the control unit is configured to determine not to include the S-NSSAI in a Registration request message in the current registration area, and the transmission and reception unit is configured to transmit the Registration request message that does not include the S-NSSAI. a transmission and reception unit and a control unit, the transmission and reception unit is configured to: in a registration procedure, transmit a Registration request message including Single Network Slice Selection Assistance information, S-NSSAI, to an Access and Mobility Management Function, AMF; and receive a response message to the Registration request message from the AMF, the response message including first identification information, or second identification information, the first identification information indicating that the S-NSSAI is not allowed in a current Public Land Mobile Network, PLMN, and the second identification information indicating that the S-NSSAI is not allowed in a current registration area, transmit a Registration request message including Single Network Slice Selection Assistance information, S-NSSAI, to an Access and Mobility Management Function, AMF; and receive a response message to the Registration request message from the AMF, the response message including first identification information, or second identification information, the first identification information indicating that the S-NSSAI is not allowed in a current Public Land Mobile Network, PLMN, and the second identification information indicating that the S-NSSAI is not allowed in a current registration area, in a registration procedure after the reception of the response message including the first identification information, the control unit is configured to determine not to include the S-NSSAI in a Registration request message in the current PLMN, and the transmission and reception unit is configured to transmit the Registration request message that does not include the S-NSSAI, and the control unit is configured to determine not to include the S-NSSAI in a Registration request message in the current PLMN, and the transmission and reception unit is configured to transmit the Registration request message that does not include the S-NSSAI, and in a registration procedure after the reception of the response message including the second identification information, the control unit is configured to determine not to include the S-NSSAI in a Registration request message in the current registration area, and the transmission and reception unit is configured to transmit the Registration request message that does not include the S-NSSAI. the control unit is configured to determine not to include the S-NSSAI in a Registration request message in the current registration area, and the transmission and reception unit is configured to transmit the Registration request message that does not include the S-NSSAI.