Abstract: A system, method and apparatus is disclosed for detection in a biometric system including the obtaining of a sequence of user's face images and making a decision about the presence of a dummy on the images. A distinctive feature of invention includes sequencing of images of the user made at the same time when the user pronounces a passphrase. In addition, predetermined mimic facial characteristics of the user are calculated, then predetermined statistic parameters of every mimic characteristic are calculated, and on this basis a coefficient of changes of the mimic characteristics within the sequence of images is calculated. The coefficient is compared with the predetermined threshold, and the decision of liveness detection on the sequence of images is concluded.