Study of the safety of a robot assisted operation using ’da Vinci Xi’ for stomach and colorectal cancer.

Interventions: A robot assisted operation using ‘da Vinci Xi’ period of ntervention: 5 years
Primary outcome(s): 1. Age, sex, height, weight, BMI, PS 2. Past medical history:Health history, operation history 3. laboratory test values 4. pathological classification associated tumor, number of lymph nodes harvested, venous invasion 5. Operative information procedure, reconstruction method, anesthesia time, surgical time, operative bleeding loss, Lymph node dissection number, completed in robot-assisted laparoscopic surgery, the reason of unsuccessful completion 6. Intraoperative and postoperative stomach cancer complication 7. Intraoperative and postoperative colorectal cancer complication 8. presence or absence of post-operation treatment and relapse, post-operation treatment of a therapeutic regimen, survival period, the start time of oral ingestion after operation, postoperative length of stay 9. The number of robot-assisted implemented, analysis of the operation time
Study Design: Single arm Non-randomized