A smart toilet (100) comprises an information acquisition device (110) and a control device (120). The information acquisition device (110) is used for acquiring characteristic information of the smart toilet (100) in a use state, the characteristic information at least comprising voiceprint information and/or odor information of a human body using the smart toilet (100). The control device (120) comprises an identity recognition module (121) for recognizing, according to the characteristic information, the identity of the human body using the smart toilet (100). Further included is an electric appliance system having the smart toilet (100).