System for sorting commercial articles and method therefor

A shipment sorting system comprising:

• a plurality of inflow lines each thereof conveys cargoes each containing articles to be shipped;
• a plurality of first buffer lines each thereof includes a first loop storage line for circulating and storing cargoes transferred from the inflow lines and a plurality of first straight storage lines, arranged in parallel and connected to the first loop storage line, for storing cargoes;
• a second buffer line including a second loop storage line connected to output ends of the first straight storage lines for circulating and storing cargoes, a plurality of second straight storage lines arranged in parallel and connected to the second loop storage line, and a plurality of return lines for returning excess unit cargoes in one of the second straight storage lines which is full of unit cargoes to another second straight storage line;
• and
• a shipment sorting area, connected to output ends of the second straight storage lines and including a plurality of shoot lines, for sorting cargoes transferred from the second straight storage lines to the plurality of shoot lines by means of sorters according to different shipment requirements.