1. A composite image creation assist apparatus that assists creation of a composite image using a plurality of first candidate images created by a target user, the apparatus comprising: a processor configured to automatically perform extracting image groups of other users belonging to a same group as the target user in a social networking service by finding the other users and image groups of other users created by the other users based on registration information of a social networking service, selecting at least one second candidate image suitable for the composite image from the image groups of other users, determining use images, which are to be used for the composite image, from the plurality of first candidate images and the one or more second candidate images, and creating the composite image using the use images.