PURPOSE: To bring a segment of a multicolor to picture drawing by a single picture drawing processing by storing the number of sub-segments in the segment, a picture element value corresponding to each sub-segment and the number of picture elements, reading out successively the number of picture elements and the picture element value, and executing a processing for repeating the picture drawing processing by the number of picture elements with respect to each picture element value.

CONSTITUTION: At the time of bringing a segment to multicolor display, the number of sub-segments is stored in a sub-segment number store means 121, a picture element value for showing a color of each bus-segment is stored in a picture element value store means 125, and the number of picture elements for showing the length of each sub-segment is stored in a picture element number store means 123. Subsequently, this picture element value and the number of picture elements are read out, and a picture drawing processing for writing the picture element value in a display memory 113 is repeated by the number of picture elements. Also, this picture drawing processing is repeated in accordance with the number of sub-segments. In such a way, picture drawing of the segment of a multicolor can be executed by a single picture drawing processing.