An information input/display device including: a sensor detecting contact and outputting contact positions; a display unit displaying video signals each corresponding to one screen; a first drawing unit generating first video signals each corresponding to one screen, when displayed, that includes an image of a drawing of a continuous line formed by the contact positions; a second drawing unit generating second video signals each corresponding to an image of the drawing of the continuous line, the second drawing unit generating images of the drawing of the continuous line at a higher speed than the first drawing unit; and an adding unit adding each of the second video signals to a corresponding one of the first video signals. Images of the drawing of the continuous line generated by at least one of the first drawing unit and the second drawing unit change as time elapses in drawing processing.