1. A server comprising: a request receiver that receives a request in which image ID information and a parameter for image processing are specified, from a terminal; an image processor that acquires an image based on the ID information that was specified in the received request, and by using the parameter that was specified in the received request to apply the image processing on the acquired image, outputs extracted information that was extracted from inside the image; and a response transmitter that transmits a response in which the extracted information that was outputted by the image processor is specified, to the terminal; wherein after the extracted information has been extracted, the image processor associates and caches the extracted information with the image ID information and the parameter; when the extracted information that is associated with the ID information and the parameter that were specified in the received request is cached, the image processor, instead of acquiring the image and applying the image processing, obtains the cached extracted information, and outputs the obtained extracted information; the image processing by the image processor includes performing character recognition; and the extracted information comprises a recognized character string corresponding to the character recognition.