A communication apparatus comprising: a master communication unit; a plurality of slave communication units (31, 3n); and a logical operation unit that is provided in a communication path between the master communication unit and the slave communication units (31, 3n) and is configured to apply a logic operation to at least one input signal received from the master communication unit and a plurality of data signals (SD0_1, SDO_n) received from the plurality of slave communication units (31, 3n) so as to generate an output signal (MISO), wherein there is performed serial communication in which the master communication unit is configured to output a reading command signal or a writing command signal simultaneously to the plurality of slave communication units (31, 3n), to read the plurality of data signals (SD0_1, SD0_n) outputted by the plurality of slave communication units (31, 3n), in a sequential and continuous manner for each of the slave communication units (31, 3n), or to write data signals in the respective slave communication units (31, 3n) in a sequential and continuous manner, wherein while the master communication unit outputs a data communication signal to the plurality of slave communication units (31, 3n), the logical operation unit is configured to output to the master communication unit, as the output signal (MISO), only a data communication signal of the slave communication unit (31, 3n) of a highest-priority, among the plurality of data signals (SD0_1, SD0_n) received from the plurality of slave communication units (31, 3n), based on a priority preliminarily determined through the logic operation; wherein each of the plurality of slave communication units (31, 3n) is configured to receive a common slave selection signal from one of the logical operation unit and the master communication unit; and wherein each of the plurality of slave communication units (31, 3n) is configured to receive a respective synchronization clock signal (CLK_1, CLK_n) from one of the logical operation unit and the master communication unit, the respective synchronization clock signal (CLK_1, CLK_n) only being output for each slave communication unit (31, 3n) among the plurality of slave communication units (31, 3n) that is a subject for communication. a master communication unit; a plurality of slave communication units (31, 3n); and a logical operation unit that is provided in a communication path between the master communication unit and the slave communication units (31, 3n) and is configured to apply a logic operation to at least one input signal received from the master communication unit and a plurality of data signals (SD0_1, SDO_n) received from the plurality of slave communication units (31, 3n) so as to generate an output signal (MISO), wherein there is performed serial communication in which the master communication unit is configured to output a reading command signal or a writing command signal simultaneously to the plurality of slave communication units (31, 3n), to read the plurality of data signals (SD0_1, SD0_n) outputted by the plurality of slave communication units (31, 3n), in a sequential and continuous manner for each of the slave communication units (31, 3n), or to write data signals in the respective slave communication units (31, 3n) in a sequential and continuous manner, wherein while the master communication unit outputs a data communication signal to the plurality of slave communication units (31, 3n), the logical operation unit is configured to output to the master communication unit, as the output signal (MISO), only a data communication signal of the slave communication unit (31, 3n) of a highest-priority, among the plurality of data signals (SD0_1, SD0_n) received from the plurality of slave communication units (31, 3n), based on a priority preliminarily determined through the logic operation; wherein each of the plurality of slave communication units (31, 3n) is configured to receive a common slave selection signal from one of the logical operation unit and the master communication unit; and wherein each of the plurality of slave communication units (31, 3n) is configured to receive a respective synchronization clock signal (CLK_1, CLK_n) from one of the logical operation unit and the master communication unit, the respective synchronization clock signal (CLK_1, CLK_n) only being output for each slave communication unit (31, 3n) among the plurality of slave communication units (31, 3n) that is a subject for communication.