Portable electronic apparatus and interactive human face login method

A portable electronic apparatus and an interactive human face login method are disclosed. The portable electronic device comprises a face database, a user interface, an image capturing device, and a recognition circuit. The face database stores a plurality of facial expression feature information. The user interface randomly generates facial expression indications used for guiding a user to sequentially show facial expressions. The image capturing device captures the facial expressions to outputs facial expression images. The recognition circuit receives a login request, and recognizes whether the facial expressions are consistent with the facial expression indications according to the facial expression feature information and the expression images. The login request is allowed when the facial expressions are consistent with the facial expression indications.