1. A method for using a shared device, wherein the shared device is provided for a plurality of processors to use, one of the processors serves as an arbitrator node, and the method for using the shared device comprises: establishing a priority sequence by the arbitrator node by steps comprising: setting an initial weight of each of the processors based on identification information of each of the processors; obtaining state diagnostic information of each of the processors, wherein the state diagnostic information indicates a transmission state of each of the processors to the arbitrator node and the shared device, the state diagnostic information comprises one or more state diagnostic codes, and each of the state diagnostic codes is corresponding to a state weight; and calculating a priority score for each of the processors to establish the priority sequence based on the initial weight corresponding to each of the processors and the one or more state weights corresponding to the one or more state diagnostic codes included by each of the processors; and when the arbitrator node simultaneously receives a request for requesting an access right of the shared device transmitted by each of two or more of the processors, determining one of the processors as having the access right of the shared device based on the priority sequence.