Stent delivery system and stent delivery method

A stent delivery method for inserting a stent delivery device to a stenosis position, the method comprising:

• obtaining an observation image from an observation device used to observe a stenosis;
• determining at least one insertion position, which is a position in a stenosis where the stent delivery device is recommended to be inserted, based on the observation image.

A control device for a stent delivery system, the stent delivery system including a stent delivery device that carries and indwells a stent to a stenosis, an observation device used to observe the stenosis, and one or more processors comprising hardware,

• wherein the one or more processors being configured to determine at least one insertion position, which is a position within the stenosis where the stent delivery system is recommended to be inserted, based on the observation image acquired from the observation device.