An information processing apparatus comprising: a processor; and a memory device operatively coupled to the processor, the memory device storing instructions that cause the processor, in cooperation with the memory device, to cause a display device to display: a first image from images associated with an observation target object, the images including the first image, and a second image, wherein each of the images is obtained at a single, respectively different focal length by a microscope; and a first annotation mark indicating a position on the second image, the first annotation mark overlapping the first image, wherein: the instructions, when executed by the processor, cause the processor to display the first annotation mark at a position on the first image which corresponds to the position on the second image; to display a second annotation mark (A3, A5) corresponding to the first image; to enable a user to select the first annotation mark; to display the second image in response to the first annotation mark being selected, wherein the first annotation mark overlaps the displayed second image; and in response to the first annotation mark being selected, cancel the display of the second annotation mark (A3, A5). a processor; and a memory device operatively coupled to the processor, the memory device storing instructions that cause the processor, in cooperation with the memory device, to cause a display device to display: a first image from images associated with an observation target object, the images including the first image, and a second image, wherein each of the images is obtained at a single, respectively different focal length by a microscope; and a first annotation mark indicating a position on the second image, the first annotation mark overlapping the first image, wherein: the instructions, when executed by the processor, cause the processor to display the first annotation mark at a position on the first image which corresponds to the position on the second image; to display a second annotation mark (A3, A5) corresponding to the first image; to enable a user to select the first annotation mark; to display the second image in response to the first annotation mark being selected, wherein the first annotation mark overlaps the displayed second image; and in response to the first annotation mark being selected, cancel the display of the second annotation mark (A3, A5). a first image from images associated with an observation target object, the images including the first image, and a second image, wherein each of the images is obtained at a single, respectively different focal length by a microscope; and a first annotation mark indicating a position on the second image, the first annotation mark overlapping the first image, wherein: the instructions, when executed by the processor, cause the processor to display the first annotation mark at a position on the first image which corresponds to the position on the second image; to display a second annotation mark (A3, A5) corresponding to the first image; to enable a user to select the first annotation mark; to display the second image in response to the first annotation mark being selected, wherein the first annotation mark overlaps the displayed second image; and in response to the first annotation mark being selected, cancel the display of the second annotation mark (A3, A5). the instructions, when executed by the processor, cause the processor to display the first annotation mark at a position on the first image which corresponds to the position on the second image; to display a second annotation mark (A3, A5) corresponding to the first image; to enable a user to select the first annotation mark; to display the second image in response to the first annotation mark being selected, wherein the first annotation mark overlaps the displayed second image; and in response to the first annotation mark being selected, cancel the display of the second annotation mark (A3, A5).