An audio input system includes an audio input apparatus and a plurality of electronic devices. The audio input apparatus includes an audio input unit, a start instruction accepting unit, and an instruction transmitter. The plurality of electronic devices includes a first electronic device. The first electronic device is a target of a process execution instruction based on the audio input by the audio input unit among the instructions. The instruction transmitter transmits a process reducing instruction for reducing an execution of a process as the instruction to the plurality of electronic devices, when an input sound volume of a microphone exceeds a specific sound volume. The audio input unit starts the audio input when the input sound volume of the microphone is equal to or less than the specific sound volume. The instruction transmitter transmits the process execution instruction to the first electronic device.