Abstract: To finely remove an offset from a tracking-error signal which is processed in the digital form at the stage of tracking servo control, an apparatus and method of correcting the offset is provided. In the apparatus and method, an oscillating tracking-error signal used for positionally controlling an optical beam irradiated onto a storage medium to reproduce information recorded thereon is produced. The tracking-error signal is produced in an analog form, then converted into a digital form for use of control of the optical beam. First, set are a first adjustment amount to correct an offset included in the analog-form tracking-error signal as well as a second adjustment amount to correct a further offset included in the digital-form tracking-error signal in the digital form. The analog-form tracking-error signal is corrected with the first adjustment amount (i.e., coarse adjustment), then the digital-form tracking-error signal is corrected with the second adjustment amount (fine adjustment).