7. A markup assistance method comprising: acquiring a feature amount for respective tags, each of the tags being assigned to character strings included in a shared markup text, at least one of the tags being different from other tags; calculating, for respective character strings, a dispersion of feature amounts of the tags; detecting a first character string assigned with a first tag having the dispersion not less than a first threshold value as a first candidate including the first tag to be corrected; assigning the tags to the character strings based on markup text edited by at least one or more users; and outputting the first candidate.
7. A markup assistance method comprising: acquiring a feature amount for respective tags, each of the tags being assigned to character strings included in a shared markup text, at least one of the tags being different from other tags; calculating, for respective character strings, a dispersion of feature amounts of the tags; detecting a first character string assigned with a first tag having the dispersion not less than a first threshold value as a first candidate including the first tag to be corrected; assigning the tags to the character strings based on markup text edited by at least one or more users; and outputting the first candidate. 12. The method according to claim 7 , wherein each of the tags is used to control a text-to-speech processing of the shared markup text.