A vehicle-mounted network system including a plurality of electronic devices operated by power supplied from a battery, the system comprising: a plurality of power supply hubs each arranged in a middle of one of power supply paths between the battery and ones of the electronic devices and connected to the ones of the electronic devices via power supply lines (SPC1, SPC2, SPC3); a plurality of power supply ICs each provided for associated one of the power supply hubs and configured to supply and cut off the power to the ones of the electronic devices connected; a plurality of power supply controllers each configured to output, to associated one of the power supply ICs, a control signal related to the supply and cut-off of the power to the one of the electronic devices connected; the electronic devices including: a first electronic device that is arranged separately from the associated power supply hub and capable of being always supplied with the power from the battery; and a second electronic device (D2, D3) that is arranged separately from the associated power supply hub and capable of being supplied with the power from the battery through an operation by an occupant of the vehicle; each of the power supply hubs being connected to the battery or another one of the power supply hubs by one of main power supply lines; each of the first and second electronic devices (D1, D2, D3) being connected to nearby one of the power supply hubs; each of the power supply controllers configured to output the control signal to the associated one of the power supply ICs so as to distribute, to the first and second electronic devices (D1, D2, D3), the power supplied to the associated one of the power supply hubs by the one of the main power supply lines, the first electronic device includes first electronic devices each connected to associated one of the power supply hubs by an independent individual power supply line, and the first electronic devices includes simultaneously used first electronic devices that are connected to a shared one of the power supply hubs by the respective individual power supply lines. a plurality of power supply hubs each arranged in a middle of one of power supply paths between the battery and ones of the electronic devices and connected to the ones of the electronic devices via power supply lines (SPC1, SPC2, SPC3); a plurality of power supply ICs each provided for associated one of the power supply hubs and configured to supply and cut off the power to the ones of the electronic devices connected; a plurality of power supply controllers each configured to output, to associated one of the power supply ICs, a control signal related to the supply and cut-off of the power to the one of the electronic devices connected; the electronic devices including: a first electronic device that is arranged separately from the associated power supply hub and capable of being always supplied with the power from the battery; and a second electronic device (D2, D3) that is arranged separately from the associated power supply hub and capable of being supplied with the power from the battery through an operation by an occupant of the vehicle; a first electronic device that is arranged separately from the associated power supply hub and capable of being always supplied with the power from the battery; and a second electronic device (D2, D3) that is arranged separately from the associated power supply hub and capable of being supplied with the power from the battery through an operation by an occupant of the vehicle; each of the power supply hubs being connected to the battery or another one of the power supply hubs by one of main power supply lines; each of the first and second electronic devices (D1, D2, D3) being connected to nearby one of the power supply hubs; each of the power supply controllers configured to output the control signal to the associated one of the power supply ICs so as to distribute, to the first and second electronic devices (D1, D2, D3), the power supplied to the associated one of the power supply hubs by the one of the main power supply lines, the first electronic device includes first electronic devices each connected to associated one of the power supply hubs by an independent individual power supply line, and the first electronic devices includes simultaneously used first electronic devices that are connected to a shared one of the power supply hubs by the respective individual power supply lines.