12. In a data processor which performs interactive processing, a help control system comprising: first means responsive to execution of commands in a user program for storing a history of changes in status of said user program; second means for storing rules for determining help messages to be displayed on the basis of said stored history of changes in status; third means for storing help messages to be displayed on the basis of said history of changes in status of said user program; fourth means for determining a help message according to the history of changes in status stored by said first means and said rules stored by said second means; and fifth means for displaying a help message determined by said fourth means.
14. A help control system according to claim 12, wherein said help messages of said third means can be changed at least by said user program.