Optical disc having a plurality of recording layers

A reading method for reading information with a laser from an optical disc including a plurality of recording layers, the method comprising:

• positioning a focus position of the laser at a first recording layer;
• reading a first information recorded in the first recording layer while the focus position of the laser is being moved toward a reading direction, the reading direction being a direction from one of an inner side and an outer side of the optical disc to the other;
• detecting a first address information recorded in the first recording layer;
• positioning the focus position of the laser at a second recording layer in response to the detection of the first address information;
• reading a second information recorded in the second recording layer while the focus position of the laser is being moved toward the reading direction;
• detecting a second address information recorded in the second recording layer;
• positioning the focus position of the laser at the first recording layer in response to the detection of the second address information;
• and
• reading a third information recorded in the first recording layer while the focus position of the laser is being moved toward the reading direction.