An apparatus is provided for converting game port input signals from a game controller into universal serial bus (USB) port signals. The apparatus includes an input unit adapted to be connected to the game controller so as to receive the game port input signals therefrom, an analog-to-digital converter for receiving analog axis signals of the game port input signals from the input unit and for converting the analog axis signals into digital axis signals in a USB interface standard-compliant format, a key signal converter for receiving key switch signals of the game port input signals from the input unit and for converting the key switch signals into digital key switch signals in the USB interface standard-compliant format, a USB driver for receiving the digital axis signals and the digital key switch signals and for generating the USB port signals, and an output unit connected to the USB driver and adapted to provide the USB signals to a USB port.