An image processing apparatus includes an encoder, a decoder, and a display unit. The encoder performs scalable encoding to encode input image data to obtain code data to be stored in a storage unit. The decoder decodes the code data stored in the storage unit to obtain decoded image data. The display unit displays an image based on the decoded image data, and receives an instruction to output the image. The image is output in response to the instruction. The decoder decodes only subcode data which is part of the code data.