1. An intonation generation method for generating an intonation of text of speech synthesized by a computer having a memory location associated therewith, the method comprising: estimating an outline of an intonation of the synthesized speech based on language information of the text and storing an estimation result in the memory; reading out the estimation result of the intonation from the memory; and selecting an intonation pattern from a database storing intonation patterns of actual speech based on the outline of the intonation, and defining the selected intonation pattern as the intonation pattern of the text.