1. An augmented reality provision system including a camera that images a real space, a display that superimposes an object image indicating a virtual object on a captured image obtained through the imaging in the camera and displays the object image, and a processor, the processor configured to perform: extracting a plurality of feature parts from the captured image including a target, the target including the plurality of feature parts having a same color; estimating light distribution characteristics of light with which the target is irradiated, from a relationship between color values in the plurality of feature parts, and obtaining the object image to which a visual effect in which the virtual object is irradiated with the light has been given depending on the light distribution characteristics, by shading and correcting a color of an original object image indicating the virtual object, wherein the light distribution characteristics of light is intensity and direction of light, wherein the target is a color chart including a plurality of color patches, the plurality of feature parts is a plurality of same color patches included in the plurality of color patches, and the processor extracts the plurality of same color patches from the captured image including the target.