An emotion engine and an emotion engine system adapted to an electronic device are provided. The emotion engine system includes a behavior control unit, a sensing unit, a time unit, and a behavior data bank. The behavior control unit provides a first behavior mode and a second behavior mode. When the sensing unit is enabled, it generates a trigger sensing signal or an initial sensing signal for the behavior control unit. The time unit generates a timing signal for the behavior control unit. The behavior data bank stores a plurality of behavior data, wherein the first and the second behavior modes are respectively corresponding to at least one of the behavior data. The behavior control unit determines the behavior data corresponding to the second behavior mode according to the timing signal, the trigger sensing signal and the first behavior mode. Additionally, an electronic device control method is also provided.