An optical disk drive is disclosed including an optical system, a servo signal detector configured to obtain control information for controlling the optical system based on the output signal of a photo detector in accordance with the recording layer to be accessed, a servo controller configured to select adjustment information in accordance with the recording layer, and adjust the control information based on the selected adjustment information. When the optical disk drive accesses an optical disk having multiple recording layers, the servo signal detector can obtain the control information for controlling the optical system in accordance with the recording layer, and the servo controller can select adjustment information in accordance with the recording layer and adjust the control information based on the selected adjustment information. The above arrangements allows the optical system to be adjusted in accordance with the recording layer to be accessed.