An input apparatus for inputting a diagnosis result of a diagnosis target detectable for a structure includes circuitry configured to display a spherical image captured for the structure on a screen, receive an input of a position of the diagnosis target in the spherical image, store position information indicating the received position of the diagnosis target in the spherical image in a memory, display, on the screen, the spherical image and a diagnosis information input field used for inputting diagnosis information of the diagnosis target, receive an input of the diagnosis information of the diagnosis target input via the diagnosis information input field, and store the diagnosis information and the position information indicating the received position of the diagnosis target in the spherical image, in the memory in association with each other.