1. A dual-camera face recognition device, comprising: a first camera for capturing a first face image; a second camera, arranged at a position different from the first camera, for capturing a second face image; and a face recognition processing unit for receiving and recognizing the first face image captured by the first camera to obtain a first candidate set, and for receiving and recognizing the second face image captured by the second camera to obtain a second candidate set, and for selecting from the first candidate set and the second candidate set a candidate object, whose similarity complies with a predetermined rule, as a recognition result, wherein the face recognition processing unit is adapted to: form a third candidate set by selecting from the first candidate set a first candidate object whose similarity is greater than a first predetermined threshold, and selecting from the second candidate set a second candidate object whose similarity is greater than a second predetermined threshold; obtain sums of similarities by computing, for each of the candidate objects in the third candidate set, a sum of (a) a similarity of the candidate object in the third candidate set with respect to the first face image captured by the first camera, and (b) a similarity of the same candidate object in the third candidate set with respect to the second face image captured by the second camera; determine whether a maximum value among the sums of similarities is greater than a third predetermined threshold; and select, as the recognition result, the candidate object corresponding to the maximum value among the sums of similarities when the maximum value is greater than the third predetermined threshold.