A voice control method for an in-vehicle device includes receiving an audio signal by an information capturing device, transmitting the audio signal to a base of the information capturing device by the information capturing device, performing voice recognition on the audio signal by the base to generate at least one context instruction, transmitting the at least one context instruction to a host of an in-vehicle device by the base, and correspondingly controlling an operation of at least one function module of the in-vehicle device according to the at least one context instruction to perform at least one context operation by the host.