An integrated speech synthesizer with an automatic identification of speaker connections and identification method includes a sound encode register to store encoded digitized sound data, a first digital to analog converter unit connected to the sound encode register to convert the digitized sound data from the sound encode register to a first analog signal and send out the first analog signal from a first output terminal, a second digital to analog converter unit connected to the sound encode register to convert the digitized sound data from the first output terminal to a second analog signal and send out the second analog signal from the first output terminal and a second output terminal, and a state register connected to the first output terminal to store the state of the first output terminal before the speech synthesizer is enabled. The state stored in the state register is used to set up the initial value and other related settings for the speech synthesizer.