Thanks to recent advances of therapeutic devices, the less invasive surgical explorations such as endoscopic submucosal resection( ESD) and laparoscopic surgery have widely gained an acceptance and become more common. During laparoscopic partial gastrectomy for submucosal tumor such as gastrointestinal stromal tumor (GIST) of the stomach, it is important to avoid an excessive surgical resection of the gastric wall, which causes a deformity of the stomach and has a potential risk to decrease oral intake. We report here a successfully treated case without any deformity of the stomach and complications using laparoscopic and endoscopic cooperative surgery (LECS) for intraluminal type of GIST. LECS is a recently developed procedure and it enables us to resect a tumor with minimum surgical margin. This procedure could be applicable for clinically benign tumor, and it is effective especially for tumors located near esophagogastric junction or pyloric ring of the stomach.