A display apparatus comprising: a display; a communicator; and a controller configured to: control the communicator to connect, through an access point, to the first portable apparatus and the second portable apparatus, receive, via the communicator, a first photo from the first portable apparatus, control the display to display the first photo according to a resolution of the display, after receiving the first photo, receive, via the communicator, a second photo from the second portable apparatus, after receiving the second photo, reduce the first photo to generate a reduced image of the first photo, and control the display to display the second photo according to the resolution of the display and to overlap the reduced image of the first photo with a part of the second photo, whereby the first photo and the second photo are displayed all together in different sizes, obtain a thumbnail image list with a first thumbnail image corresponding to the first photo and a second thumbnail image corresponding to the second photo, and control the communicator to transmit the thumbnail image list to the first portable apparatus and the second portable apparatus, wherein the first thumbnail image includes a metadata corresponding to the first photo and the second thumbnail image includes a metadata corresponding to the second photo. a display; a communicator; and a controller configured to: control the communicator to connect, through an access point, to the first portable apparatus and the second portable apparatus, receive, via the communicator, a first photo from the first portable apparatus, control the display to display the first photo according to a resolution of the display, after receiving the first photo, receive, via the communicator, a second photo from the second portable apparatus, after receiving the second photo, reduce the first photo to generate a reduced image of the first photo, and control the display to display the second photo according to the resolution of the display and to overlap the reduced image of the first photo with a part of the second photo, whereby the first photo and the second photo are displayed all together in different sizes, obtain a thumbnail image list with a first thumbnail image corresponding to the first photo and a second thumbnail image corresponding to the second photo, and control the communicator to transmit the thumbnail image list to the first portable apparatus and the second portable apparatus, wherein the first thumbnail image includes a metadata corresponding to the first photo and the second thumbnail image includes a metadata corresponding to the second photo. control the communicator to connect, through an access point, to the first portable apparatus and the second portable apparatus, receive, via the communicator, a first photo from the first portable apparatus, control the display to display the first photo according to a resolution of the display, after receiving the first photo, receive, via the communicator, a second photo from the second portable apparatus, after receiving the second photo, reduce the first photo to generate a reduced image of the first photo, and control the display to display the second photo according to the resolution of the display and to overlap the reduced image of the first photo with a part of the second photo, whereby the first photo and the second photo are displayed all together in different sizes, obtain a thumbnail image list with a first thumbnail image corresponding to the first photo and a second thumbnail image corresponding to the second photo, and control the communicator to transmit the thumbnail image list to the first portable apparatus and the second portable apparatus, wherein the first thumbnail image includes a metadata corresponding to the first photo and the second thumbnail image includes a metadata corresponding to the second photo.