A voiceprint authentication apparatus is provided, comprising: a voice receiving module configured to receive a user's voices in different speaking modes; a feature extraction module configured to extract respective sets of voice features from the user's voices in different speaking modes; a synthesis module configured to generate a first voiceprint template by synthesizing the respective sets of voice features; and a first communication module configured to send the first voiceprint template to a server to authenticate the user, wherein the user's voices and the respective sets of voice features are not sent to the server. A corresponding voice authentication method, as well as a computer readable medium, are also provided.