Abstract: A method and device for implementing a portable guide and guard system is provided. The portable guide and guard device includes a mini-camera, a sound gathering/broadcasting unit and a 3G wireless communicator. The communicator sends the AV signal to remote service center through an AV transmitting function of 3G wireless communication system, and the service personnel in the center answers the user in response to the received live image and sound so as to assist the user contacted therewith. The service center has functions of videoing, monitoring and emergency assistance. Through the combination of the abundant database system, network information searching and various on-line services provided by the service center, the portable guide and guard device can provide foreign language communication/translation, guiding, consulting, network information providing, monitoring, videoing, security protecting and emergency assisting for global foreign tourists, blind and dumb people or security service personnel.