1. An apparatus for measuring a mail size and acquiring mail information, the apparatus comprising: a plurality of height measurement sensor modules configured to, when a mail is placed in a weight measurement space with a reflective plate installed therein, sense position information used to measure a size of the mail by using the reflective plate; a height value generation controller configured to calculate a height value of the mail, based on the position information sensed by the plurality of height measurement sensor modules; and a mail information generator configured to extract a barcode and an address region from an image of the mail acquired by a camera, read out the barcode from the extracted barcode and address region to recognize an address, and generate mail information.