1. An apparatus for improving the quality of a captured image, comprising: a processor; and a memory device storing instructions for configuring the processor, wherein the processor is configured by the instructions to: combine a plurality of information maps to generate a subject map of a first image; separate, based on the subject map, a foreground portion of the first image from a background portion of the first image; compute, based on the background portion, a first value representing a background complexity of the first image; compute, based on both the foreground and the background portions, and by using a plurality of edge maps with different scales, a second value representing a blurriness of the first image; and generate advice for capturing a second image based on both of the first and second computed values.