1. An image reproducing method comprising: obtaining digital image data recorded by a digital image recording device obtaining recording information representing a recording condition specific to the digital image recording device; storing the digital image data and the recording information together as an image file together in an image server; carrying out image processing of the image file for enhancing a picture quality of the digital image data having been stored in the storage medium by using the stored recording information to determine an optimal image processing condition; and reproducing the digital image data on which the image processing has been carried out based on the optimal image processing condition.