1. A light curtain installation method for adjusting or checking an installation state of a light curtain for detecting an operation with respect to an image plane of a display apparatus, the method comprising: determining whether or not it is possible to detect an object that comes into contact with a target region on the image plane which corresponds to a reference pixel which is a pixel at a predetermined position; and setting a drive state of the reference pixel such that the drive state of the reference pixel is different depending on a result of the determining, wherein a plurality of markers are displayed in the target region on the image plane by the reference pixel in the determining, wherein the display of the markers is stopped in the setting in a case where it is possible to detect the object, wherein the display of the markers continues in the setting in a case where it is not possible to detect the object, and wherein the target region is a circumferential edge section of the image plane.