1. A voice selection supporting device comprising: a memory; and one or more processors configured to function as an acceptance unit, an analysis unit, an evaluation unit, a candidate presentation unit and a voice synthesis unit, wherein the acceptance unit accepts input of a text; the analysis unit performs a morphological analysis of the text and obtains an attribute of the text by referring to text analysis knowledge, the text analysis knowledge associating attributes with results of the morphological analysis for texts respectively; the evaluation unit evaluates respective similarities between the voice attributes for the voice dictionaries and the obtained attribute of the text, each of the voice attributes indicating voice characteristics of a speaker for a voice synthesis, each of the voice dictionaries corresponding to the speaker for the voice synthesis; the candidate presentation unit presents, based on the similarities, a candidate of the speaker from the voice dictionaries suitable for the text; and the voice synthesis unit reads the text corresponding to the candidate of the speaker into synthesized voices.
2. The voice selection supporting device according to claim 1 , wherein the memory is configured to function as a dictionary storage unit; and the one or more processors is further configured to function as a voice synthesis unit, a selection acceptance unit and a result output unit, the dictionary storage unit stores therein the voice dictionaries; the voice synthesis unit converts, based on an instruction from a user, all or a part of the input text into a voice by using the presented candidate of the speaker, and presents the voice to the user; the selection acceptance unit accepts a selection instruction for the voice dictionaries from the user; and the result output unit that outputs the selection result.