To provide an information processing device, an information processing method, a program, and an image display device, in which as to a synthesized image generated by connecting a plurality of digital images, a user can easily recognize reliability of the connected part.

An information processing device includes: an image synthesizing unit for connecting a plurality of partial images, each obtained by imaging a part of an observation target area; and a connecting information generation unit for generating connecting information for a synthetic image synthesized by the image synthesizing unit. The connecting information is supplied to an image display device, in which the synthetic image can be browsed, together with the synthetic image or separately from the synthetic image.