1. An information processor comprising: a storage unit configured to store data representing three-dimensional appearance features of a target operational device in a real world and data of an operation image used for operation of the target operational device; an acquisition unit configured to acquire an image captured by a camera; a recognition unit configured to recognize an operational device included in the image based on the data representing the three-dimensional appearance features stored in the storage unit; a finger recognition unit configured to recognize a size of a finger of a user included in the image captured by the camera; a display control unit configured to display the operation image based on the data of the operation image stored in the storage unit if the operational device included in the image is recognized by the recognition unit as the target operational device in the real world; and a control unit configured to transmit a command to the recognized target operational device when the size of finger of the user becomes smaller than immediately before, wherein the display control unit displays the operation image at a position of a display corresponding to a position of the recognized target operational device included in the image, and wherein the storage unit, the acquisition unit, the recognition unit, the finger recognition unit, the display control unit, and the control unit are each implemented via at least one processor.