In a communication method, the method includes: receiving a first AMBR of a slice, where the first AMBR indicates a quantity of GBR resources and a quantity of non-GBR resources in the slice, and the first AMBR is a subscribed slice AMBR or an authorized slice AMBR; determining a second AMBR of the slice based on the first AMBR, a session-AMBR of an activated PDU session of the slice, and a flow control bit rate of a QoS flow of the activated PDU session of the slice, where the flow control bit rate is a GFBR or an MFBR; and performing traffic control on the slice based on the second AMBR. The AMBR of the slice may indicate a quantity of GBR resources and a quantity of non-GBR resources in the slice.