A hand display control device includes a processor. The processor causes an oscillation circuit to output a first frequency signal or a second frequency signal to a first processing circuit that executes processing for operating a hand in response to the first frequency signal. The oscillation circuit outputs the first frequency signal or the second frequency signal by switching. The second frequency signal is higher in frequency than the first frequency signal. The processor controls whether to output the second frequency signal to a second processing circuit that performs previously determined certain processing in response to the second frequency signal. The processor controls the switching of the oscillation circuit depending on whether the certain processing is performed. The processor prohibits the first processing circuit from performing a specific operation of the hand while the second processing circuit is performing the certain processing.