1. An information processing device comprising: a detection unit configured to detect at least one mesh including a horizontal direction position of a target sound image in a horizontal direction, of meshes that are a region surrounded by a plurality of loudspeakers, and specify at least one mesh boundary that is a movement target of the target sound image in the mesh; and a calculation unit configured to calculate a movement position of the target sound image on the specified at least one mesh boundary that is the movement target, based on positions of two of the loudspeakers present on the specified at least one mesh boundary that is the movement target, and the horizontal direction position of the target sound image.