The present disclosure relates to a portable electronic device for authenticating a user through a management device and a system and method associated therewith. The portable electronic device includes a collector, an authentication information generator and a communication interface. The collector is configured to collect biometric data of a user. The authentication information generator is configured to generate authentication information according to whether the portable electronic device is within an area pre-set by the management device and based on the biometric data collected by the collector in real time. The communication interface is configured to send the generated authentication information to the management device so as to authenticate whether the user is a registered user of the management device. By collecting relevant data in a distributed manner during the user authentication process, user authentication efficiency is improved, and risk of damage to data collection equipment is reduced.