A server comprising: a communication circuitry configured to communicate with a medical imaging apparatus (100, 100-1, 100-2); and a controller configured to: control the communication circuitry to receive a medical image and a first rejection code from the medical imaging apparatus (100, 100-1, 100-2), the first rejection code corresponding to a digital code indicating an unusability of the medical image for diagnosis and being assigned to the medical image from a user of the medical imaging apparatus (100, 100-1, 100-2); perform an image processing on the medical image to determine a second rejection code corresponding to a digital code indicating an unusability of the medical image for diagnosis, in responding to receiving the medical image and the first rejection code; determine whether to transmit, to the medical imaging apparatus (100, 100-1, 100-2), information generated in association with a result of a comparison between the first rejection code from the medical imaging apparatus (100, 100-1, 100-2) and the second rejection code determined from the image processing; and control the communication circuitry to transmit the information generated in association with the result of the comparison to the medical imaging apparatus when the first rejection code and the second rejection code are different. a communication circuitry configured to communicate with a medical imaging apparatus (100, 100-1, 100-2); and a controller configured to: control the communication circuitry to receive a medical image and a first rejection code from the medical imaging apparatus (100, 100-1, 100-2), the first rejection code corresponding to a digital code indicating an unusability of the medical image for diagnosis and being assigned to the medical image from a user of the medical imaging apparatus (100, 100-1, 100-2); perform an image processing on the medical image to determine a second rejection code corresponding to a digital code indicating an unusability of the medical image for diagnosis, in responding to receiving the medical image and the first rejection code; determine whether to transmit, to the medical imaging apparatus (100, 100-1, 100-2), information generated in association with a result of a comparison between the first rejection code from the medical imaging apparatus (100, 100-1, 100-2) and the second rejection code determined from the image processing; and control the communication circuitry to transmit the information generated in association with the result of the comparison to the medical imaging apparatus when the first rejection code and the second rejection code are different. control the communication circuitry to receive a medical image and a first rejection code from the medical imaging apparatus (100, 100-1, 100-2), the first rejection code corresponding to a digital code indicating an unusability of the medical image for diagnosis and being assigned to the medical image from a user of the medical imaging apparatus (100, 100-1, 100-2); perform an image processing on the medical image to determine a second rejection code corresponding to a digital code indicating an unusability of the medical image for diagnosis, in responding to receiving the medical image and the first rejection code; determine whether to transmit, to the medical imaging apparatus (100, 100-1, 100-2), information generated in association with a result of a comparison between the first rejection code from the medical imaging apparatus (100, 100-1, 100-2) and the second rejection code determined from the image processing; and control the communication circuitry to transmit the information generated in association with the result of the comparison to the medical imaging apparatus when the first rejection code and the second rejection code are different.