According to an embodiment, a speech synthesis dictionary generation apparatus includes an analyzer, a speaker adapter, a level designation unit, and a determination unit. The analyzer analyzes speech data and generates a speech database containing characteristics of utterance by an object speaker. The speaker adapter generates the model of the object speaker by speaker adaptation of converting a base model to be closer to characteristics of the object speaker based on the database. The level designation unit accepts designation of a target speaker level representing a speaker's utterance skill and/or a speaker's native level in a language of the speech synthesis dictionary. The determination determines a parameter related to fidelity of reproduction of speaker properties in the speaker adaptation, in accordance with a relationship between the target speaker level and a speaker level of the object speaker.