To provide a technology for improving diagnostic capabilities in image diagnosis.

This information processor includes: a first acquisition means for acquiring image data based on specimen information concerning at least one of structure and functions obtained from a specimen; a second acquisition means for acquiring information on the gravity direction when the information is obtained from the specimen; a relative gravity direction information generation means for generating relative gravity direction information showing the relative gravity direction relative to a coordinate system of an image based on the information on the gravity direction; and a relating means for relating the relative gravity direction information to the image data.