An information processing apparatus connected to an image sensor and to first and second projection apparatuses (15, 16), comprising: an acquisition unit that is configured to acquire output values of a plurality of pixels from the image sensor, the image sensor including the plurality of pixels, the plurality of pixels having a predetermined pixel size; a projection control unit configured to cause the first projection apparatus to project a first pattern image, and to cause the second projection apparatus to project a second pattern image, the first pattern image including boundaries between bright sections and dark sections, wherein the first pattern image is a checker pattern in which the bright sections and the dark sections are alternately arranged along first and second directions, wherein the first pattern is such that a size of bright and dark sections of the checker pattern in an image captured by the image sensor are larger than the predetermined pixel size of the image sensor, and wherein the second pattern image is the same image as the first pattern image; a storage unit that is configured to store, as reference values, output values of predetermined reference pixels where the boundaries are formed, the output values being acquired from the image sensor that picks up the first pattern image projected by the first projection apparatus, the predetermined reference pixels including two reference pixels that are away from each other in opposite directions from an adjustment pixel along the first direction by a predetermined amount of pixels and two reference pixels that are away from each other in opposite directions from the adjustment pixel along the second direction by the predetermined amount of pixels, wherein the adjustment pixel is a pixel located at an intersection point between a first boundary extending along the first direction and a second boundary extending along the second direction; and an adjusting unit that is configured, when the second pattern image is projected by the second projection apparatus after the projection of the first pattern image is stopped, to adjust the projection position of the second projection apparatus in units of movement smaller than the predetermined pixel size until the output values of the predetermined reference pixels approaches the stored reference values, the direction of movement being determined by comparing the output values of the predetermined reference pixels and the stored reference values, the output values of the predetermined reference pixels being acquired from the image sensor that picks up the second pattern image projected by the second projection apparatus. an acquisition unit that is configured to acquire output values of a plurality of pixels from the image sensor, the image sensor including the plurality of pixels, the plurality of pixels having a predetermined pixel size; a projection control unit configured to cause the first projection apparatus to project a first pattern image, and to cause the second projection apparatus to project a second pattern image, the first pattern image including boundaries between bright sections and dark sections, wherein the first pattern image is a checker pattern in which the bright sections and the dark sections are alternately arranged along first and second directions, wherein the first pattern is such that a size of bright and dark sections of the checker pattern in an image captured by the image sensor are larger than the predetermined pixel size of the image sensor, and wherein the second pattern image is the same image as the first pattern image; a storage unit that is configured to store, as reference values, output values of predetermined reference pixels where the boundaries are formed, the output values being acquired from the image sensor that picks up the first pattern image projected by the first projection apparatus, the predetermined reference pixels including two reference pixels that are away from each other in opposite directions from an adjustment pixel along the first direction by a predetermined amount of pixels and two reference pixels that are away from each other in opposite directions from the adjustment pixel along the second direction by the predetermined amount of pixels, wherein the adjustment pixel is a pixel located at an intersection point between a first boundary extending along the first direction and a second boundary extending along the second direction; and an adjusting unit that is configured, when the second pattern image is projected by the second projection apparatus after the projection of the first pattern image is stopped, to adjust the projection position of the second projection apparatus in units of movement smaller than the predetermined pixel size until the output values of the predetermined reference pixels approaches the stored reference values, the direction of movement being determined by comparing the output values of the predetermined reference pixels and the stored reference values, the output values of the predetermined reference pixels being acquired from the image sensor that picks up the second pattern image projected by the second projection apparatus.