PURPOSE: To display a speech content object on a half-mirror surface by a means, which is as simple as possible, neither upside down nor inversely symmetrically.

CONSTITUTION: This device is provided with a lighting device 21 which has a lighting panel 28 on the top surface and internally has a light source 23 and a photodetection device 31 which has the half-mirror 32 stood and arranged at a specific position about the lighting device 21; after an original film 10 is prepared by copying necessary original contents of characters, an image, etc., as the speech content object onto a light-transmissive film such as a transparent film, the original film 10 is turned over and mounted and held upside down on the surface of the lighting panel 28 of the lighting device (necessary original contents), and the necessary original contents on the original film 10 are projected on the surface of the half-mirror 32 of the photodetection device 31 by light irradiation from the light source 23.