Provided is a surgical robot system for realizing single-port surgery and multi-port surgery, the system comprising: an operating device; and a controlling device for electro-mechanically controlling the operating device, wherein the operating device includes an alignment section having a plurality of main robot arms, and a plurality of manipulating sections each having a plurality of auxiliary robot arms, and in the multi-port surgery mode, the plurality of main robot arms and at least a portion of the plurality of auxiliary robot arms are operated so that each surgical tool coupled to each of the plurality of manipulating sections can be placed in correspondence with each of a plurality of incisions, and in the single-port surgery mode, the plurality of main robot arms and at least a portion of the plurality of auxiliary robot arms are operated so that each surgical tool coupled to each of the plurality of manipulating sections can be aligned in correspondence with one incision.