Provided is a POS peripherals controlling device including: a wireless communication unit; an interface part including at least one interface unit; and a controller determining whether data received from a mobile POS host device through the wireless communication unit includes control data for controlling at least one POS peripheral connected through the interface part, when the received data includes control data, checking a target POS peripheral where the control data is to be delivered among the at least one peripheral, and transmitting control data included in the received data to the checked POS peripheral through a first interface unit connected to the checked target peripheral among the at least one interface unit, wherein the control data is generated by the mobile POS host device and is generated in a format corresponding to the target peripheral that is to receive the control data.