A dual modem device includes a first processor to communicate with a first network and a second processor to communicate with a second network. The first processor includes a USB module to transceive a signal with a computer side using a universal serial bus (USB) interface, a first packet control block to determine a type of the signal transceived via the USB module and to decide a communication path, and a first function block to process a signal associated with the first network. The second processor includes a first control block to process a control signal for the first processor, a second control block to process a control signal for the second processor, and a second function block to process a signal associated with the second network.