1. An information processor comprising: a camera configured to take an image of a person; a CPU configured to: (i) perform face recognition on a captured image with a first image quality obtained from the image taken by the camera, (ii) determine whether a behavior of the person satisfies a predetermined condition, and (iii) perform face recognition on a captured image with a second image quality obtained from the image taken by the camera, when it is determined that the behavior of the person satisfies the predetermined condition, the second image quality being higher than the first image quality; and a detector configured to detect a user operation, wherein the CPU determines that the behavior of the person satisfies the predetermined condition (i) in a case where the detector has detected the user operation, (ii) in a case where a size of a face recognized from the captured image with the first image quality is equal to or larger than a predetermined size, and (iii) in a case where a moving amount of the face recognized from the captured image with the first image quality is equal to or less than a predetermined amount.