A network system mounted on a vehicle, the network system comprising: a plurality of sensors; a first bus connected to the plurality of sensors, the first bus being used when the plurality of sensors transmit sensing data; a plurality of actuators; a second bus connected to the plurality of actuators, the second bus being used when the plurality of actuators receive control data; a central electronic control unit configured to perform an operation based on the sensing data, and generate the control data as data for collectively performing vehicle control using the plurality of actuators; a third bus connected to the central electronic control unit, the third bus being used when the central electronic control unit receives the sensing data and transmits the control data; and a repeater connected to the first bus, the second bus, and the third bus, the repeater being configured to pass data flowing on the first bus to the third bus while shaping a waveform of the data, pass data flowing on the third bus to the second bus while shaping the waveform of the data, and block a flow of data from the third bus to the first bus and a flow of data from the second bus to the third bus, wherein the repeater includes a first circuit connected to the first bus as an input source and the third bus as an output destination, the first circuit being configured to pass the data flowing on the first bus to the third bus while shaping the waveform of the data; and a second circuit connected to the third bus as an input source and the second bus as an output destination, the second circuit being configured to pass the data flowing on the third bus to the second bus while shaping the waveform of the data, wherein, while the data flow on the bus, waveform distortion, such as oscillation of the waveform (ringing), destruction of the waveform (rounding), and attenuation of the waveform, is generated, whereby a deterioration of the communication quality due to a data error is caused, and shaping the waveform of the data includes generating a waveform having an amplitude and a shape of a regulated signal waveform, the regulated signal waveform representing a waveform having the same signal value as the signal value of the input data signal and is a waveform from which ringing or rounding have been removed, and outputting the waveform as an output data signal, thereby curbing deterioration of the communication quality. a plurality of sensors; a first bus connected to the plurality of sensors, the first bus being used when the plurality of sensors transmit sensing data; a plurality of actuators; a second bus connected to the plurality of actuators, the second bus being used when the plurality of actuators receive control data; a central electronic control unit configured to perform an operation based on the sensing data, and generate the control data as data for collectively performing vehicle control using the plurality of actuators; a third bus connected to the central electronic control unit, the third bus being used when the central electronic control unit receives the sensing data and transmits the control data; and a repeater connected to the first bus, the second bus, and the third bus, the repeater being configured to pass data flowing on the first bus to the third bus while shaping a waveform of the data, pass data flowing on the third bus to the second bus while shaping the waveform of the data, and block a flow of data from the third bus to the first bus and a flow of data from the second bus to the third bus, wherein