On a recording medium serving as a verification object, a picture whose state changes in accordance with optical conditions is formed. A verification apparatus images a plurality of pictures of the recording medium while changing an optical relationship among a light source for illuminating the recording medium, a camera for imaging a picture of the recording medium, and the recording medium with a condition modifying unit. The verification apparatus displays the plurality of pictures of the recording medium imaged by the camera, on the display unit in a state in which the optical relationship has been changed. The verification apparatus determines imaging conditions for imaging a picture for verification on the basis of the optical relationship at the time of photographing selected pictures among the plurality of pictures displayed on the display unit.