An information storage medium of this invention comprises a first representation object, and a first time map wherein playback management information which controls simultaneous reproduction of the first representation object and a second representation object in at least a specific period includes first reference information to refer to the first time map, the first time map includes second reference information to refer to second management information including first management information about the first representation object, the first management information includes third reference information to refer to the first representation object, the playback management information includes fourth reference information to refer to a second time map, and the second time map has a data structure including fifth reference information to refer to the second representation object.