The present invention provides a guidance marking system and an information processing method thereof. The guidance marking system includes a plurality of guidance marks and an information processing device, wherein the guidance marks are used for outputting guidance information, and the information processing device is configured to acquire the travel demand information and travel path set of a guidance target, calculate the flow distribution of the guidance target in the travel path set based on the travel demand information, determine the priority levels of the guidance target in selecting connected path sections at each node based on the flow distribution, and make the guidance marks distributed at each node output guidance information corresponding to the priority levels. With the information processing method of the guidance marking system provided by the technical schemes of the invention adopted, guidance targets can be distributed to the most reasonable paths, so that the guidance targets can be uniformly distributed in a road network, the pressure of local key nodes or channels can be decreased, the possibility of congestion can be reduced, and the accuracy and efficiency of guidance can be effectively improved.