An indicator control apparatus includes a bus connector, a signal converting unit, an address configuring unit, and an indicating unit. The signal converting unit receives bus signals from the bus connector. The address configuring unit sets an address of the signal converting unit. The signal converting unit converts the bus signals to digital input/output (I/O) signals in response to the address of the signal converting unit matching with the bus signals. The indicating unit is driven by the I/O signals and correspondingly displays information.