Abstract: A substrate processing apparatus includes: a rotary holder configured to hold and rotate a substrate; a cup arranged so as to surround the substrate held by the rotary holder; a coating liquid nozzle configured to inject a coating liquid onto the substrate; a removal liquid nozzle configured to inject, onto the substrate, a removal liquid for removing a film from a peripheral portion of the substrate; a nozzle tracking camera attached to a nozzle arm that holds the coating liquid nozzle so as to track the coating liquid nozzle and configured to capture an image of the coating liquid nozzle; and a processing space camera configured to capture an image of a processing space above the rotary holder.

Abstract: An information acquisition system is for acquiring information about a substrate processing apparatus including a substrate holder configured to hold and rotate a substrate, a nozzle configured to supply a processing liquid to a surface of the substrate which is rotating, and a cup surrounding the substrate held by the substrate holder. The information acquisition system includes: an information acquisition body held in place of the substrate by the substrate holder and including an imaging part configured to image the cup and acquire image data; and an acquisition part configured to acquire information about a height of the cup based on the image data.