Provided herein are an apparatus and method for inserting a branch stent. A plurality of insertion guide rods for being delivered to a vascular or non-vascular bifurcation to which a stent expansion wire is connected are configured in an insert tube. In this way, a branch stent can be immediately delivered to the vascular or non-vascular bifurcation and expanded through just one operation so that an operation related to the branch stent is conveniently and promptly performed.