1. A medical image processing apparatus comprising: a processor; and a memory storing instructions that, when executed by the processor, cause the apparatus to: acquire a tomographic image of an eye to be examined; acquire a result of a visual field measurement for the eye to be examined; detect, from the tomographic image, a layer thickness of a predetermined layer of the eye to be examined; display information indicating a relationship between the layer thickness and the result of the visual field measurement, wherein the information is displayed in a display form in accordance with the layer thickness and the result of the visual field measurement, the display form being changed in accordance with the layer thickness and the result of the visual field measurement; acquire a fundus image of the eye to be examined; associate the layer thickness and the result of the visual field measurement with the fundus image; create a graph representing the relationship between the layer thickness and the result of the visual field measurement as the information based on the association; and segment a region of the graph into a plurality of cells, wherein the relationship graph is displayed in different color gradations indicating a stage of glaucoma, and wherein a color gradation for each of the plurality of segmented cells is determined based on the relationship between the layer thickness and the result of the visual field measurement, and wherein the relationship graph includes abscissa and ordinate axes, and one of the abscissa and the ordinate axes indicates the layer thickness and the other of the abscissa and ordinate axes indicates the result of the visual field measurement.