Reading device and communication system

A reading device, comprising:

• a scanner configured to read a document and to generate image data representing the read document;
• a storage device configured to store image data downloaded from a server;
• and
• a processor configured to provide:
• an uploading unit configured to upload the image data read by the scanner to the server on a network;
• a storage time limit setting unit configured to set a storage time limit within which the image data is stored on the server;
• a judgment unit configured to judge whether the storage time limit has expired with respect to the image data uploaded on the server;
• a data management unit configured to:
• download, from the server, the image data for which the judgment unit judges that the storage time limit has expired;
• store the downloaded image data in the storage device;
• and
• delete, from the server, the image data corresponding to the downloaded image data
• a re-upload unit configured to re-upload, to the server, the downloaded image data designated from data stored in the storage device by a user command inputted by a user;
• and
• a storage time limit re-setting unit configured to set a storage time limit within which the downloaded image data is stored on the server for the downloaded image data to be re-uploaded by the re-upload unit, wherein the judgment unit is configured to judge whether the storage time limit set by the storage time setting unit has expired with respect to the image data uploaded to the server by the uploading unit, and to judge whether the storage time limit set by the storage time re-setting unit has expired with respect to the downloaded image data re-uploaded to the server by the re-upload unit.