1. An information processing device comprising: an image acquirer configured to acquire a shot image of a user; a registered user information holder configured to hold face identification data of a registered user; a first authentication section configured to detect a face image of a registered user existing in the shot image by using face identification data held in the registered user information holder; a second authentication section configured to detect an image of an object having a predetermined positional relationship with a region of the face image detected by the first authentication section; and an information processing section configured to execute information processing based on detection results by the first authentication section and the second authentication section, wherein the second authentication section uses information obtained in detection processing by the first authentication section for detection processing of the image of the object.