A multi-motor system comprising a plurality of motor units (106A, 106B), each of the plurality of motor units (106A, 106B) including: a motor (116A, 116B); a communication circuit (110A, 110B) to receive a command (12A- 12D) which is transmitted from an external device outside the motor unit (106A, 106B); a control circuit (112A, 112B) to generate a control signal for rotating the motor (116A, 116B) with a controlled variable that is designated by the command (12A - 12D); and a motor driving circuit (114A, 114B) to flow a current in the motor (116A, 116B) based on the control signal, wherein, the command (12A - 12D) includes: control data (C1, C2, D1, D2) indicating the controlled variable of the motor (116A, 116B) in fixed-point data, the controlled variable being expressed by using an integer part and a fractional part; and position-designating data (A1, A2) designating a position of a radix point in the control data (C1, C2, D1, D2), the position-designating data (A1, A2) is independently determined for each motor unit (106A, 106B) by the external device, and the control circuit (112A, 112B) extracts the integer part and the fractional part from the control data (C1, C2, D1, D2) by using the position-designating data (A1, A2), and generates the control signal in accordance with the controlled variable being composed of the extracted integer part and fractional part. each of the plurality of motor units (106A, 106B) including: a motor (116A, 116B); a communication circuit (110A, 110B) to receive a command (12A- 12D) which is transmitted from an external device outside the motor unit (106A, 106B); a control circuit (112A, 112B) to generate a control signal for rotating the motor (116A, 116B) with a controlled variable that is designated by the command (12A - 12D); and a motor driving circuit (114A, 114B) to flow a current in the motor (116A, 116B) based on the control signal, wherein, a motor (116A, 116B); a communication circuit (110A, 110B) to receive a command (12A- 12D) which is transmitted from an external device outside the motor unit (106A, 106B); a control circuit (112A, 112B) to generate a control signal for rotating the motor (116A, 116B) with a controlled variable that is designated by the command (12A - 12D); and a motor driving circuit (114A, 114B) to flow a current in the motor (116A, 116B) based on the control signal, wherein, the command (12A - 12D) includes: control data (C1, C2, D1, D2) indicating the controlled variable of the motor (116A, 116B) in fixed-point data, the controlled variable being expressed by using an integer part and a fractional part; and position-designating data (A1, A2) designating a position of a radix point in the control data (C1, C2, D1, D2), control data (C1, C2, D1, D2) indicating the controlled variable of the motor (116A, 116B) in fixed-point data, the controlled variable being expressed by using an integer part and a fractional part; and position-designating data (A1, A2) designating a position of a radix point in the control data (C1, C2, D1, D2), the position-designating data (A1, A2) is independently determined for each motor unit (106A, 106B) by the external device, and the control circuit (112A, 112B) extracts the integer part and the fractional part from the control data (C1, C2, D1, D2) by using the position-designating data (A1, A2), and generates the control signal in accordance with the controlled variable being composed of the extracted integer part and fractional part.