1. An image processing device comprising: one or more processors operable to: acquire depth information of an object included in a captured image; generate a composite image by combining the object with an image object in another image having depth information, according to each piece of the depth information of the object; and execute effect processing on the composite image in an event a difference between the depth information of the object in the captured image and the depth information of the image object in the other image is greater than or equal to a threshold value, wherein the one or more processors are operable to provide an indication to guide a movement of the object to a predetermined position in an event the object is separated from the image object.