A location of a preview image of a dynamic image is determined not to be stored in memory. A request for a frame number of at least one static image included in the dynamic image to an acquired network address is transmitted in response to determining the preview image is not stored in the memory. An issued frame number from the network address is received and the issued frame number is set as a designated frame number for the at least one static image. The at least one static image is extracted having the set designated frame number. The at least one static image is displayed having the set designated frame number as the preview image to a user.