The purpose of this study is to determine optimal prophylactic antibiotics administration method in elective laparoscopic colorectal surgery.

The use of antibiotic prophylaxis in patients who undergo elective colorectal surgery is now accepted universally. But the rout of administration should be systematic, oral, or both is controversial. Furthermore, although many trails have been performed, no trial limited to laparoscopic surgery is performed. We compare 2 approaches - oral and systemic versus systemic antibiotic prophylaxis - in limited to elective laparoscopic colorectal surgery.

Inclusion Criteria:

• Colorectal tumor(cancer, adenoma and suspected cases) with planned elective laparoscopic colorectal resection

Exclusion Criteria:

• ECOG Performance Status >=2
• Age<20
• Any organ dysfunction
• Ileus
• Preoperative infectious disease
• Antibiotic administration before surgery
• Steroid administration before surgery
• Neo-adjuvant radiation and/or chemo therapy
• Severe diabetes mellitus
• Pregnancy/lactational woman
• Severe allergy