During three months, two months, one month, two weeks and one week before the election day, the average Google trend values (g) and differences (Δg) of major presidential candidates. In each presidential election, blue and red candidates are corresponded to 17th: Dong-young Jeong (blue), Myung-bak Lee (red), 18th: Jae-in Moon (blue), Geun-hye Park (red), 19th: Jae-in Moon (blue), Jun-pyo Hong (red).