1. A method of calibrating an image capture environment for an image capturing unit, the method comprising: an obtaining step of obtaining an image of a physical space captured by the image capturing unit; a detecting step of detecting an index from the captured image of the physical space; an estimation step of estimating a position and orientation of the image capturing unit based on the index detected in the detecting step; a presenting step of presenting a plurality of distinctive candidates for a target position and orientation of the image capturing unit where the image of the physical space for calibrating the image capture environment is to be captured based on the estimated position and orientation of the image capturing unit; and a calibrating step of calibrating the image capture environment of the image capturing unit based on the image of the physical space captured by the image capturing unit at the target position and orientation.