A hobby determining unit counts the number of times of appearances of tag information by using the number of imaging days of the images, for each kind of the tag information, and determines that a first user has a hobby related to the tag information for which a ratio of the number of times of appearances of the tag information to the total number of times of appearances of all kinds of the tag information items is equal to or greater than a threshold value, or counts the number of times of appearances of the tag information by using the number of the images, and determines that a first user has a hobby related to the tag information for which the number of times of appearances of the tag information is equal to or greater than the threshold value.