In a vehicle equipped with a plurality of electronic devices, a power-saving system (100) saves electricity while comprehensively controlling the power supply status to each of the plurality of electronic devices. The power-saving system (100) includes: power supply status control portion (11) controlling the power supply status to each of the plurality of electronic devices depending on a usage situation of the vehicle; and usage situation determination portion (10) determining the usage situation on the basis of information useful for determining a usage situation, including information related to a usage date and time, current location or driver of the vehicle. The power supply status control portion (11) controls the power supply status to each of the plurality of electronic devices on the basis of a predetermined power supply status to each of the plurality of electronic devices set depending on a usage situation and the usage situation determined by the usage situation determination portion (10).