1. A remote control system, comprising: a remote controller, comprising: a first input unit, generating a voice recognition request signal; and a second input unit, generating a microphone request signal; and a receiving host, having a first functional module, providing a voice recognition function, wherein the receiving host receives the voice recognition request signal to drive the first functional module to provide the voice recognition function; and a second functional module, providing a microphone function, wherein the receiving host receives the microphone request signal to drive the second functional module to provide the microphone function.