A terminal device comprising: a reception unit configured to: receive first information used to allow simultaneous transmission of Channel State Information, CSI, and Hybrid Automatic Repeat Request Acknowledgment, HARQ-ACK, using a Physical Uplink Control Channel, PUCCH, format 3, and receive second information used to allow simultaneous transmission of the CSI and the HARQ-ACK using a PUCCH format 4, and receive third information used to configure a first behavior or a second behavior for transmission of the HARQ-ACK, the first behavior being a behavior which uses the PUCCH format 3 or the PUCCH format 4, the second behavior being a behavior which always uses the PUCCH format 4; and a transmission unit configured to: transmit one or more of the HARQ-ACK and the CSI; wherein, based on at least the first information, the second information, the third information, and whether or not the HARQ-ACK corresponds to Physical Downlink Shared Channel, PDSCH, transmission on a secondary cell, any of the following processing operations to are executed: a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3, a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4, a processing operation in which the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3 and the CSI is dropped, and a processing operation in which the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4 and the CSI is dropped. receive first information used to allow simultaneous transmission of Channel State Information, CSI, and Hybrid Automatic Repeat Request Acknowledgment, HARQ-ACK, using a Physical Uplink Control Channel, PUCCH, format 3, and receive second information used to allow simultaneous transmission of the CSI and the HARQ-ACK using a PUCCH format 4, and receive third information used to configure a first behavior or a second behavior for transmission of the HARQ-ACK, the first behavior being a behavior which uses the PUCCH format 3 or the PUCCH format 4, the second behavior being a behavior which always uses the PUCCH format 4; and a transmission unit configured to: transmit one or more of the HARQ-ACK and the CSI; wherein, based on at least the first information, the second information, the third information, and whether or not the HARQ-ACK corresponds to Physical Downlink Shared Channel, PDSCH, transmission on a secondary cell, any of the following processing operations to are executed: a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3, a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4, a processing operation in which the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3 and the CSI is dropped, and a processing operation in which the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4 and the CSI is dropped. transmit one or more of the HARQ-ACK and the CSI; wherein, based on at least the first information, the second information, the third information, and whether or not the HARQ-ACK corresponds to Physical Downlink Shared Channel, PDSCH, transmission on a secondary cell, any of the following processing operations to are executed: a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3, a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4, a processing operation in which the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3 and the CSI is dropped, and a processing operation in which the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4 and the CSI is dropped. a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3, a processing operation in which the CSI multiplexed with the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4, a processing operation in which the HARQ-ACK is transmitted with a third PUCCH resource using the PUCCH format 3 and the CSI is dropped, and a processing operation in which the HARQ-ACK is transmitted with a fourth PUCCH resource using the PUCCH format 4 and the CSI is dropped.