Optical disk and optical disk reproduction system

An optical disk reproduction system comprising:

• an optical disk drive device that reads out and decodes recorded information from among various information recorded on an optical disk on a frame-by-frame basis, each of a plurality of frames comprising a main channel where data are recorded and a subcode providing additional information including recorded positions of the data, wherein table-of-contents information, for the data recorded in the main channel, is contained in the main channel of the optical disk, said optical disk drive device controlling information readout from the optical disk based on the table-of-contents information;
• and
• a host system that deciphers the table-of-contents information, read out from the optical disk and decoded by said optical disk drive device, to provide deciphered table-of-contents information, and transfers the deciphered table-of-contents information back to said optical disk drive device.

An optical disk including a lead-in area, a program area, and a lead-out area, the optical disk having various information recorded thereon on a frame-by-frame basis, each of a plurality of frames being organized in a predetermined format comprising:

• a main channel where data are recorded;
• and
• a subcode for providing additional information including recorded positions of the data, wherein table-of-contents (TOC) information for the data recorded in the main channel is contained in the main channel of the optical disk, and the TOC information is recorded in the program area.