To provide the status of the cribrosa lamina of an eye of a living body as diagnostic material. A tomographic image forming part 232 of a fundus observing device 1 forms a horizontal tomographic image Wi based on a three-dimensional image V of a fundus Ef. A cribrosa-lamina region specifying part 233 specifies a cribrosa-lamina region Uj by analyzing the horizontal tomographic image Wi. A hole region specifying part 234 specifies a hole region Pk in the cribrosa-lamina region Uj by analyzing the horizontal tomographic image Wi. The distribution information generating part 235 generates distribution information representing the distribution of the hole region Pk in the cribrosa-lamina region Uj based on the specifying results of the cribrosa-lamina region Uj and the hole region Pk. This distribution information is displayed by a display 240.
