The present invention provides a robot apparatus with a vocal interactive function. The robot apparatus 1 receives a vocal input from the ambient environment, such as a user, and the vocal input is a conversation voice or an evaluation voice. The robot apparatus 1 receives a conversation voice from the user at first, and generates output data responding to the conversation voice, and receives an evaluation voice from the user. The evaluation voice is a response from the user to the output data, and the robot apparatus 1 updates a weighted value of the output data based on the user response. Consequently, the robot apparatus may output different and variable output data when receiving the same vocal input. The present invention also provides a vocal interactive method adapted for the robot apparatus.