To provide an installation state confirmation apparatus for confirming an installation state of a commodity in a room, wherein determination whether an object to be installed in the room can be installed and determination whether the object is matched with a surrounding environment or the like can be simply performed.

The installation state confirmation system 1 includes: an installation surface specification means for specifying a commodity installation surface by specifying four installation positions of the commodity installation surface on an installation place image obtained by imaging an installation place; a notification means for comparing the size information of a commodity with the respective vertical, horizontal and height dimensions of the installation place, determining whether the commodity can be installed on the installation place, and when determining that the commodity cannot be installed, notifying that the installation of the commodity is impossible; and a commodity display image determination means for determining a display image of the commodity, from a plurality of commodity images of two-dimensional image data obtained when observing the commodity at predetermined angular intervals from the front direction of the commodity up to the side surface direction, based on a visual-point position of the installation place image.