A recording medium on which authoring program data is recorded in such a manner that it is able to be run by a computer, said recording medium effecting the steps of:
- a program-data recording step of recording input program data onto a memory in data sections of first data-lengths, said data sections being recorded in said memory successively;
- a switching step of switching from said program-data recording step to an image-data recording step in a case where the program data is recorded by a data length equal to a second data-length;
- and
- said image-data recording step of recording an image data segment capable of reproduction and display independent of the recorded input program data in a case where a data length of the image data segment is equal to or exceeds a predetermined length.