Patent ID: 7787743

Claim:
An information recording medium, readable by a play back unit, on which information recording medium there are recorded information for enabling operation of a play back unit, the recorded information comprising: an object data file storing i) a first stream, packetized by a unit of packet, the first stream including video information or still picture information and ii) a second stream, packetized by a unit of packet, the second stream including a plurality of menu information each of which is displayed in response to a user operation and can select a reproduction point of the first stream or a change of reproduction condition of the first stream in response to the user operation; a play list information storing i) a plurality of item information each of which specifies the first stream by a unit of an item and ii) a plurality of sub item information each of which specifies the second stream by a unit of a sub item; and an object information file including (i) first address table information which is not packetized by a unit of packet and which includes an address of the packet belonging to the first stream which is specified by the item information and (ii) second address table information which is not packetized by a unit of packet and which includes an address of the packet belonging to the second stream which is specified by the sub item information, the plurality of item information and the plurality of sub item information being recorded in the play list information independently and separately from each other, the object data file, the play list information and the object information file being recorded on the information recording medium independently and separately from each other, one menu information of the plurality of menu information specified by the sub item information being superimposed on a display of the first stream during a reproduction of the first stream specified by the item information, the first stream and the second stream being recorded such that the reproduction of the video information or the still picture information included in the first stream which is reproduced before the display of the one menu information is kept, by controlling the first stream and the second stream independently and separately, during the one menu information is superimposed, said menu information being pre-loaded before reproduction of said video information or said still picture information.