1. A method for processing graphic data using a graphic data processing apparatus, the method comprising: reading data from an information storage medium, the data comprising a display set comprising an object segment and a composition segment, the object segment comprising graphic object data defining a graphic object to be used in composing a graphic screen to be displayed on a display device, the object segment further comprising time information indicating a time when the graphic object data is to be stored, the composition segment comprising composition information for the graphic object defined by the graphic object data to be used in composing the graphic screen, the composition information specifying how the graphic object is to be displayed on the graphic screen; storing, using the graphic data processing apparatus, the graphic object data at the time indicated by the time information of the object segment, the graphic object data being stored for a predetermined time so that the graphic object data remains available for use for the predetermined time; storing, using the graphic data processing apparatus, the composition information; and outputting, using the graphic data processing apparatus, the graphic object data according to the composition information; wherein the composition information comprises time information indicating an output time when the stored graphic object data is to be output to the display device.