The invention provides a processing method, a processing device and a processing system for an information transmission service. The method comprises the following steps of: receiving an information transmission notice from an information function (AF) server, wherein the information transmission notice is used for notifying a terminal that the AF server has information transmission contents to be transmitted; acquiring the congestion conditions of a cell currently with the terminal; determining an information transmission notification strategy according to the congestion conditions; transmitting the information transmission notice to the terminal according to the information transmission notification strategy; and transmitting the type information of the information transmission contents corresponding to the information transmission notice to a policy and charging rules function (PCRF) server, so that the PCRF server can allocate network resources required by the transmission of the information transmission contents to the terminal according to the type information. By the method, the device and the system, the transmission of the information transmission notice to the terminal in network congestion is avoided, so that a network load is alleviated.