A terminal apparatus comprising: a first radio control processing unit configured to process an RRC message of one of EUTRA and NR; and a second radio control processing unit configured to process an RRC message of another one of the EUTRA and the NR, wherein in a case that SRB3 which is a signaling radio bearer of a secondary cell group is established, the second radio control processing unit is configured to submit a measurement report message to a lower layer of the secondary cell group in order to transmit the measurement report message to a secondary node by using the SRB3, in a case that the SRB3 is not established, the second radio control processing unit is configured to deliver data including the measurement report message to the first radio control processing unit, the first radio control processing unit is configured to generate an information message including the data, the first radio control processing unit is configured to submit the information message to a lower layer of a master cell group in order to transmit the information message to a master node by using a signaling radio bearer of a master cell group, and in the case that (i) the SRB3 is not established and (ii) a split SRB, which uses a direct path to the master node and a path through the secondary node, is set as the signaling radio bearer of the master cell group, the second radio control processing unit is configured to deliver the data including the measurement report message to the first radio control processing unit, and the first radio control processing unit is configured to submit the information message to a PDCP layer of the master cell group in order to transmit the information message to the master node via a direct path to the master node and a path through the secondary node. a first radio control processing unit configured to process an RRC message of one of EUTRA and NR; and a second radio control processing unit configured to process an RRC message of another one of the EUTRA and the NR, wherein in a case that SRB3 which is a signaling radio bearer of a secondary cell group is established, the second radio control processing unit is configured to submit a measurement report message to a lower layer of the secondary cell group in order to transmit the measurement report message to a secondary node by using the SRB3, in a case that the SRB3 is not established, the second radio control processing unit is configured to deliver data including the measurement report message to the first radio control processing unit, the first radio control processing unit is configured to generate an information message including the data, the first radio control processing unit is configured to submit the information message to a lower layer of a master cell group in order to transmit the information message to a master node by using a signaling radio bearer of a master cell group, and in the case that (i) the SRB3 is not established and (ii) a split SRB, which uses a direct path to the master node and a path through the secondary node, is set as the signaling radio bearer of the master cell group, the second radio control processing unit is configured to deliver the data including the measurement report message to the first radio control processing unit, and the first radio control processing unit is configured to submit the information message to a PDCP layer of the master cell group in order to transmit the information message to the master node via a direct path to the master node and a path through the secondary node.