Disclosed is a data processing service for digital camera having a storage medium with a capacity for small number of images. The service is intended to increase obtainable number of images in an easy and less expensive manner while the user carries the camera away from home. A method of the service conducted at a shop (3-1) includes; a step for reading a photographed image data recorded in a memory (10) of a digital camera (1) using a service terminal (6); and a step for preserving the read-in photographed image data to a storage medium (2, 4) accessible by the user. After the photographed image data is transferred, the user can take additional photographs using the original recoding medium in the digital camera.