To solve such a problem that when an attention target object once imaged goes out of a frame of a picked-up image, even if the attention target object still exists on the periphery of the imaging field, it is not possible to confirm the existence of the attention target object on the periphery of the imaging field on the display screen.

In an information processor that displays an image picked up by an imaging means on a display means, picked-up images are acquired sequentially, an image of the attention target object is recognized from the acquired images, information for identifying the image of the recognized attention target object is held, and when the image of the attention target object once recognized is not recognized from images acquired thereafter, the picked-up image and the information for identifying the attention target object are synthesized and displayed on the display means.