14. The computer readable medium according to claim 13 , further comprising calculating the similarity between respective users based on the feature amounts of tags assigned to each character string by respective users, and to select a second candidate based on tags assigned by first user whose the similarity is not less than a second threshold value, the second candidate indicating a candidate of tag to be assigned to the first candidate, wherein the outputting the first candidate further presents the second candidate.
14. The computer readable medium according to claim 13 , further comprising calculating the similarity between respective users based on the feature amounts of tags assigned to each character string by respective users, and to select a second candidate based on tags assigned by first user whose the similarity is not less than a second threshold value, the second candidate indicating a candidate of tag to be assigned to the first candidate, wherein the outputting the first candidate further presents the second candidate. 15. The computer readable medium according to claim 14 , wherein the outputting the first candidate presents the second candidate and the first candidate in association with each other.