To easily understand the contents of a moving image taken by an image taking apparatus. An image conversion block 150 converts a taken image on the basis of conversion information. A transparency conversion block 160 converts the transparency in the converted taken image. A image synthesis block 170 synthesizes the taken image with the transparency converted with a log image and holds a resultant new log image in an image memory 180. An index image extraction block 190 extracts a new index image from among the converted taken images on the basis of the coordinate position and size of an index image in an image taking space. A selection block 270 selects an index image on the basis of the position of a selected representative image when the position of a panorama image displayed on a display block 292 is selected. A display control block 291 displays a panorama image on the display block 292 and displays the selected index image, overlapped on the panorama image.