An ophthalmic system comprising a slit lamp microscope (1, 2000-i n) and an information processing apparatus that are connected to each other via a communication path, wherein the slit lamp microscope comprises: an image acquisition device configured to acquire a three dimensional image by photographing a subject's eye; and a first communication device configured to transmit the three dimensional image to the information processing apparatus, and the information processing apparatus comprises: a second communication device configured to receive the three dimensional image transmitted by the first communication device; a display controller configured to display a first image based on the three dimensional image on a display device; a partial region designation processor configured to designate a partial region of the first image; and a rendering processor configured to render the three dimensional image based on the partial region to construct a second image, wherein the display controller configured to display the second image on the display device, wherein the image acquisition device comprises: an illumination system configured to illuminate the subject's eye with slit light; an imaging system configured to guide returning light of the slit light from the subject's eye to an imaging device; a movement device configured to move the illumination system and the imaging system; and a focal position changer (40, 50) configured to change at least one of a focal position of the illumination system and a focal position of the imaging system; and the ophthalmic system further comprises a three dimensional image construction processor configured to construct a three dimensional image based on a plurality of cross sectional images acquired by the imaging device in parallel with both movement of at least one of the illumination system and the imaging system and change in at least one of the focal position of the illumination system and the focal position of the imaging system. the slit lamp microscope comprises: an image acquisition device configured to acquire a three dimensional image by photographing a subject's eye; and a first communication device configured to transmit the three dimensional image to the information processing apparatus, and an image acquisition device configured to acquire a three dimensional image by photographing a subject's eye; and a first communication device configured to transmit the three dimensional image to the information processing apparatus, and the information processing apparatus comprises: a second communication device configured to receive the three dimensional image transmitted by the first communication device; a display controller configured to display a first image based on the three dimensional image on a display device; a partial region designation processor configured to designate a partial region of the first image; and a rendering processor configured to render the three dimensional image based on the partial region to construct a second image, wherein the display controller configured to display the second image on the display device, wherein a second communication device configured to receive the three dimensional image transmitted by the first communication device; a display controller configured to display a first image based on the three dimensional image on a display device; a partial region designation processor configured to designate a partial region of the first image; and a rendering processor configured to render the three dimensional image based on the partial region to construct a second image, wherein the display controller configured to display the second image on the display device, wherein the image acquisition device comprises: an illumination system configured to illuminate the subject's eye with slit light; an imaging system configured to guide returning light of the slit light from the subject's eye to an imaging device; a movement device configured to move the illumination system and the imaging system; and a focal position changer (40, 50) configured to change at least one of a focal position of the illumination system and a focal position of the imaging system; and an illumination system configured to illuminate the subject's eye with slit light; an imaging system configured to guide returning light of the slit light from the subject's eye to an imaging device; a movement device configured to move the illumination system and the imaging system; and a focal position changer (40, 50) configured to change at least one of a focal position of the illumination system and a focal position of the imaging system; and the ophthalmic system further comprises a three dimensional image construction processor configured to construct a three dimensional image based on a plurality of cross sectional images acquired by the imaging device in parallel with both movement of at least one of the illumination system and the imaging system and change in at least one of the focal position of the illumination system and the focal position of the imaging system.