A portable apparatus includes an image capturing device, a display device, an indoor image acquisition unit, an apparatus position acquisition unit, an apparatus information acquisition unit, and a display control unit. The indoor image acquisition unit acquires an indoor image of a building having a plurality of floors. The apparatus position acquisition unit acquires a position of an electronic apparatus in real space. The apparatus information acquisition unit acquires apparatus information on the electronic apparatus. The display control unit causes the display device to display a composite image formed by combining additional information based on the apparatus information with a to-be-combined image, while linking the additional information to a position of the electronic apparatus in the to-be-combined image, this position corresponding to a relationship between the position of the electronic apparatus in real space and a position of the portable apparatus in real space.