To provide construction of an image data filing system to a user without labor and cost, and to reduce labor of maintenance of a service provider constructing and providing the image data filing system.

The image data filing system is provided with a scanner 10 reading a document to generate image data, having a communication function, and sending the image data via the Internet 100 along with identification information data for identifying a sender, and a file server 20 connected to the scanner 10 via the Internet 100 and storing the sent image data in coordination with the identification information data.