A frequency control apparatus includes a signal generator configured to generate an output signal as a digital signal having a target frequency that has been set, using a plurality of signals having frequencies that are different from the target frequency and one another, an estimator configured to estimate a mixed frequency that is a frequency of a signal component mixed in the output signal and different from the target frequency and each of frequencies of the plurality of signals, and a frequency shift unit configured to shift at least one of the target frequency and the frequencies of the plurality of signals in accordance with an estimation result of the mixed frequency.