1. An image pick-up device having a monitor display section or a finder display section, the image pick-up device comprising: a photography advisability information obtaining unit which obtains photography advisability information indicating whether or not an image can be picked-up; and a display controlling unit which displays a target mark to be used as the criterion of the image picking-up on the monitor display section or the finder display section and which changes the display form of the target mark according to the content of the photography advisability information.