A terminal device that communicates with a base station device by using a plurality of serving cells including a primary cell, PCell, and a secondary cell, SCell, the terminal device comprising: a reception unit configured to receive, from the base station device, a first parameter used for indicating that a power headroom is to be reported using a first Medium Access Control, MAC, control element, and receive, from the base station device, a second parameter used for indicating that simultaneous transmission of a Physical Uplink Control CHannel, PUCCH, and a Physical Uplink Shared CHannel, PUSCH, is configured for the PCell or the SCell; a MAC processing unit configured to obtain a first value of type 2 power headroom for the SCell configured with the PUCCH in a case that the first parameter is configured, the second parameter is not configured for the SCell, the SCell is configured with the PUCCH, and the SCell configured with the PUCCH is activated, and obtain a second value of type 2 power headroom for the PCell in a case that the first parameter is configured, the SCell is not configured with the PUCCH, and the second parameter is configured for the PCell; and a transmission unit configured to transmit, to the base station device, the first value of type 2 power headroom or the second value of type 2 power headroom. a reception unit configured to receive, from the base station device, a first parameter used for indicating that a power headroom is to be reported using a first Medium Access Control, MAC, control element, and receive, from the base station device, a second parameter used for indicating that simultaneous transmission of a Physical Uplink Control CHannel, PUCCH, and a Physical Uplink Shared CHannel, PUSCH, is configured for the PCell or the SCell; receive, from the base station device, a first parameter used for indicating that a power headroom is to be reported using a first Medium Access Control, MAC, control element, and receive, from the base station device, a second parameter used for indicating that simultaneous transmission of a Physical Uplink Control CHannel, PUCCH, and a Physical Uplink Shared CHannel, PUSCH, is configured for the PCell or the SCell; a MAC processing unit configured to obtain a first value of type 2 power headroom for the SCell configured with the PUCCH in a case that the first parameter is configured, the second parameter is not configured for the SCell, the SCell is configured with the PUCCH, and the SCell configured with the PUCCH is activated, and obtain a second value of type 2 power headroom for the PCell in a case that the first parameter is configured, the SCell is not configured with the PUCCH, and the second parameter is configured for the PCell; and obtain a first value of type 2 power headroom for the SCell configured with the PUCCH in a case that the first parameter is configured, the second parameter is not configured for the SCell, the SCell is configured with the PUCCH, and the SCell configured with the PUCCH is activated, and obtain a second value of type 2 power headroom for the PCell in a case that the first parameter is configured, the SCell is not configured with the PUCCH, and the second parameter is configured for the PCell; and a transmission unit configured to transmit, to the base station device, the first value of type 2 power headroom or the second value of type 2 power headroom.