Transmitting device, receiving device, data transmission method

A receiving device comprising:

• a receiver that receives a partial image that includes a certain region identified from image data and has been associated with region information indicating the certain region and subjected to predetermined image processing;
• a storage unit that stores a partial image to be displayed;
• and
• a display updating unit that causes the received partial image to be stored in the storage unit as the partial image to be displayed instead of another partial image having added thereto the same region information as the received partial image and chronological information indicating that the other partial image has been generated before generation of the received partial image.

A method for transmitting data, the method comprising:

• identifying a certain region from image data, generating a certain partial image including the certain region identified from the image data, associating region information indicating the certain region with the certain partial image, and causing the region information and the certain partial image to be stored in a data storage unit;
• executing, on the certain partial image associated with the region information and stored in the data storage unit, predetermined image processing associated with the region information;
• determining whether or not there is a difference between the certain partial image after the image processing and another partial image generated before the generation of the certain partial image and subjected to the image processing;
• and
• transmitting the certain partial image subjected to the image processing by the image processing unit if it is determined that there is the difference.