A multilayer optical information medium comprising three or more information layers, wherein: address information indicating positions in each of the information layers is recorded in a helical manner; the information layers comprise at least one I to O layer in which values representing addresses in the address information increase from an inner perimeter section toward an outer perimeter section, and at least one O to I layer in which the values representing the addresses in the address information increase from the outer perimeter section toward the inner perimeter section; layer specifying information specifying the information layer is attached to the address information; the information layers comprise frames for storing the address information and layer specifying information; wherein the I to O layer and the O to I layer are laminated alternately; an I to O layer and an O to I layer adjacent to each other form a group, and a group number is assigned to the group; the layer information is added to the address information to a higher-order bit, and the group information is added to an even higher order bit; the layer specifying information comprises a combination of the group number and the layer information; the layer information and the address information of the I to O layer and the layer information and the address information of the O to I layer are bit-inverted or sign-inverted versions of each other; all of the I to O layers have substantially the same address information except for group numbers and all of the O to I layers have substantially the same address information except for group numbers; wherein the layer information is provided in a frame different from the address information and wherein the group number is stored in a frame different from the frames for storing the layer information and the address information, said different frame being a new frame created for storing the group number using a spare frame. address information indicating positions in each of the information layers is recorded in a helical manner; the information layers comprise at least one I to O layer in which values representing addresses in the address information increase from an inner perimeter section toward an outer perimeter section, and at least one O to I layer in which the values representing the addresses in the address information increase from the outer perimeter section toward the inner perimeter section; layer specifying information specifying the information layer is attached to the address information; the information layers comprise frames for storing the address information and layer specifying information; wherein the I to O layer and the O to I layer are laminated alternately; an I to O layer and an O to I layer adjacent to each other form a group, and a group number is assigned to the group; the layer information is added to the address information to a higher-order bit, and the group information is added to an even higher order bit; the layer specifying information comprises a combination of the group number and the layer information; the layer information and the address information of the I to O layer and the layer information and the address information of the O to I layer are bit-inverted or sign-inverted versions of each other; all of the I to O layers have substantially the same address information except for group numbers and all of the O to I layers have substantially the same address information except for group numbers; wherein the layer information is provided in a frame different from the address information and wherein the group number is stored in a frame different from the frames for storing the layer information and the address information, said different frame being a new frame created for storing the group number using a spare frame.