PROBLEM TO BE SOLVED: To appropriately adjust the drawn content, when another image is to be superposed over a partial region of a geographical map image displayed on a display screen, so that the whole display image displayed on the display screen is to have an appropriate quantity of information in addition to displaying the map image in the partial region screen to be translucently displayed.;SOLUTION: A display controller causes a superposed display image IS containing a translucent region TR through at least part of which a geographical map image IM is transmitted to be superposed over a superposed display region SR of a geographical map image IM to generate a display image ID and display it on a display unit. The display controller so performs control that the states of object displaying in the translucent region TR differ according to object types constituting the geographical map image IM: a first type object is transparently displayed through the superposed display image IS, a second type object is not displayed, and a third type object is transparently displayed or not displayed according to the superposed state between the object and the superposed display region and predetermined display conditions.;SELECTED DRAWING: Figure 6;COPYRIGHT: (C)2017,JPO&INPIT
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