Simultaneous operations for synchronous cancers are thought to increase in the near future due to recent advancement of laparoscopic surgery. A 75-year-old male patient was admitted to our hospital and diagnosed as synchronous gastric and rectal cancer (gastric cancer: cT2N0M0 StageIB, rectal cancer: cSEN0M0 StagII). The simultaneous totally laparoscopic total gastrectomy and low anterior resection was scheduled. The low anterior resection was first performed with five ports on the lower abdomen, and followed by the total gastrectomy with addition of 3 ports on the upper abdomen. The postoperative course was uneventful. This case suggest that the simultaneous totally laparoscopic total gastrectomy and low anterior resection was useful operation for patients with synchronous gastric and rectal cancers. We herein report the case and discuss based on some literatures.