An information-capturing device, comprising: a near-field communication module configured to receive an event message, wherein the event message includes a destination information which specifies a dedicated identification code; a video recording unit configured to capture ambient data; a storing unit, wherein the information capturing device has a first identification code which is stored in the storing unit; and a controlling unit coupled to the near-field communication module, the video recording unit, and the storing unit, and configured to compare the first identification code with the dedicated identification code specified by the destination information contained in the event message, wherein the controlling unit is configured to start the video recording unit for capturing the ambient data, if the first identification code matches the dedicated identification code specified by the destination information contained in the event message; and the controlling unit is configured to broadcast the event message to further information-capturing devices within a signal sensing radius through the near-field communication module, if the first identification code does not match the dedicated identification code specified by the destination information contained in the event message; wherein the information-capturing device further comprises: a remote communication module coupled to the controlling unit; wherein the controlling unit is configured to generate a report signal according to the event message, and then the remote communication module is configured to send the report signal to a server, wherein the report signal includes the event message which further includes a source information indicating an identification code of a state sensor which generates the event message, and consequently, informing the server of the place where an event occurs and a position data of the information-capturing device. a near-field communication module configured to receive an event message, wherein the event message includes a destination information which specifies a dedicated identification code; a video recording unit configured to capture ambient data; a storing unit, wherein the information capturing device has a first identification code which is stored in the storing unit; and a controlling unit coupled to the near-field communication module, the video recording unit, and the storing unit, and configured to compare the first identification code with the dedicated identification code specified by the destination information contained in the event message, coupled to the near-field communication module, the video recording unit, and the storing unit, and configured to compare the first identification code with the dedicated identification code specified by the destination information contained in the event message, wherein the controlling unit is configured to start the video recording unit for capturing the ambient data, if the first identification code matches the dedicated identification code specified by the destination information contained in the event message; and the controlling unit is configured to broadcast the event message to further information-capturing devices within a signal sensing radius through the near-field communication module, if the first identification code does not match the dedicated identification code specified by the destination information contained in the event message; wherein the information-capturing device further comprises: a remote communication module coupled to the controlling unit; wherein the controlling unit is configured to generate a report signal according to the event message, and then the remote communication module is configured to send the report signal to a server, wherein the report signal includes the event message which further includes a source information indicating an identification code of a state sensor which generates the event message, and consequently, informing the server of the place where an event occurs and a position data of the information-capturing device. a remote communication module coupled to the controlling unit; wherein the controlling unit is configured to generate a report signal according to the event message, and then the remote communication module is configured to send the report signal to a server, wherein the report signal includes the event message which further includes a source information indicating an identification code of a state sensor which generates the event message, and consequently, informing the server of the place where an event occurs and a position data of the information-capturing device.