In a communication system, in which an image forming apparatus and an information processing apparatus are connected via a network and remote maintenance is performed between the image forming apparatus and the information processing apparatus, the image forming apparatus has a wireless communication unit for performing wireless communication with a mobile terminal and determines whether or not remote maintenance using the mobile terminal is possible. In a case that it is determined that the remote maintenance is possible, the image forming apparatus establishes wireless communication with the mobile terminal in response to a connection request from the mobile terminal, and performs input/output of audio data via the mobile terminal with the information processing apparatus.