Abstract: As a communication setting system and method for an Internet of things (IoT) device using a mobile communication terminal, the present invention relates to: a system comprising a mobile communication terminal for outputting a setting information sound wave signal in which access setting information for network access of various IoT devices is synthesized, and an IoT device which receives the setting information sound wave signal outputted from the mobile communication terminal so as to set network access information on the basis of the access setting information; and a method for setting a network access of an IoT device by using a mobile communication terminal. According to the present invention as configured above, it is possible to automatically set a network access of an IoT device by simply using a mobile communication terminal even without physically connecting separate equipment for setting a network access to various IoT devices.