To provide a system which can enter displays into display buffers of the same level and make displays of the same level by turns by giving alternate display flags indicating whether or not alternate displays are made to the display entries.

Of the display control system which outputs different kinds of image and voice on a display device, the display device is provided with a display buffer which stores display contents complying with display requests and a control part 3 which controls the display device according to the contents of the display buffer; and the display buffer has entries showing priority levels, each of which has display order, display contents corresponding to the display order, the output level of voice, whether or not alternate displays are made, and a display time.