A user apparatus includes a communication unit configured to communicate with a first base station apparatus and a second base station apparatus, wherein the first base station apparatus is a master node in a New Radio (NR) radio communication system and the second base station apparatus is a secondary node in the NR radio communication system; a reception unit configured to receive from the first base station apparatus an instruction to measure a system frame number and frame timing difference (SFTD) representing a system frame number and frame timing difference between cells; a control unit configured to measure SFTD between a cell of the first base station apparatus and a cell of the second base station apparatus based on the instruction to measure SFTD; and a transmission unit configured to transmit to the first base station apparatus a measurement result including the measured SFTD.