When executing an replacement process on a multi-layer recording optical disc, alternate recording regions are successively used starting at the nearest spare area from an objective lens regardless of the layer where the replacement process is generated. Alternatively, in the spare area of each layer, a priority spare area is provided for executing an alternation with a higher priority by shifting the radial position from the other layer. Alternatively, arrangement is performed so that the radial position or the alternative recording start radial position of the spare area of each layer is not superposed on the upper or the lower layer spare area.