An information recording method, including detecting a synchronous signal and first address information from a recording medium, on which the synchronous signal and the first address information have been preformatted in a wobbled groove track, which is divided into a first unit with a predetermined length on the wobbled groove track. The method further includes constructing the track into second units, the second unit having a length different from the first unit with the predetermined length, and generating second address information indicating the constructed second units.