Abstract: A graph displaying device and method whereby when functional expression data for producing graphs and the conditions of displaying the graphs are set, graphs for functional expressions data input in accordance with the conditions are displayed in corresponding colors on a display. First, functional expression data and corresponding color data which designate display colors of the graphs are input in corresponding relationship. In addition, range data which display coordinates and color data designating display colors of coordinates involved in the range data are input together. In response to this operation, the graphs for the input functional expression data are produced with the range data to which the color data are designated, the last-mentioned color data corresponding to color data which correspond to the functional expression data. The produced graphs and the coordinates are displayed in the corresponding designated colors.

Abstract: An object image display device which changes and displays the image of an object such as an animal or a building. A display displays an object image including a combination of patterns of the parts of the object. The pattern of at least part of the object image displayed on the display is successively changed to a different part pattern of the same at least part in response to the keying operation of keys. Thus, the display displays the object image such that the at least part of the object image successively moves. The user is able to set a shape to which the object image is changed and the timing of changing the object image. Each time the object image is changed, a voice corresponding to the aspect of change of the object image is output sequentially to the outside. Externally inputting a voice into the device changes at least a part of the object image displayed at present in accordance with the contents of the input voice.

Abstract: A graph display apparatus includes a plurality of functional formulas to be displayed as graphs and their coordinate ranges are stored in a memory by operating numeric .multidot. symbol keys on a key input unit. The plurality of stored formulas are displayed on a display unit by operating a "list" key. When a plurality of arbitrary formulas are designated and a "synthesis" key is operated, the graphs of the designated formulas are calculated and displayed on a single coordinate system in accordance with coordinate ranges of the formula which is designated first. When the plurality of arbitrary formulas are designated and a "division" key is operated, the functional formulas are displayed on different coordinate systems in accordance with corresponding coordinate ranges. When the graphs of a plurality of input formulas are calculated and displayed, the individual graphs can be appropriately synthesized or divided and can be displayed in comparison with each other.