A network quality determining method, the method performed by a network quality determining apparatus and comprising: when experience quality represented by a customer experience index of a target user within a first time period is lower than experience quality represented by a customer experience index threshold, determining, by using a first parameter value corresponding to a network key performance indicator, KPI, parameter of the target user within a second time period and that is collected by a collection device in a carrier network, a second parameter value corresponding to the network KPI parameter of the target user within the second time period in a home network, wherein the customer experience index is used to represent user service experience quality, the network KPI parameter is used to represent network quality, and the second time period comprises the first time period; comparing network quality represented by the second parameter value of the network KPI parameter with network quality represented by a first threshold corresponding to the network KPI parameter in the home network; and when the network quality represented by the second parameter value of the network KPI parameter is lower than the network quality represented by the first threshold, determining that quality of the home network is poor; wherein the determining, by using a first parameter value corresponding to a network KPI parameter of the target user within a second time period and that is collected by a collection device in a carrier network, a second parameter value corresponding to the network KPI parameter of the target user within the second time period in a home network comprises: determining the second parameter value based on the first parameter value and a baseline threshold of the network KPI parameter, wherein the baseline threshold is used to represent network quality of a network between the collection device and a connection location between the carrier network and the home network. when experience quality represented by a customer experience index of a target user within a first time period is lower than experience quality represented by a customer experience index threshold, determining, by using a first parameter value corresponding to a network key performance indicator, KPI, parameter of the target user within a second time period and that is collected by a collection device in a carrier network, a second parameter value corresponding to the network KPI parameter of the target user within the second time period in a home network, wherein the customer experience index is used to represent user service experience quality, the network KPI parameter is used to represent network quality, and the second time period comprises the first time period; comparing network quality represented by the second parameter value of the network KPI parameter with network quality represented by a first threshold corresponding to the network KPI parameter in the home network; and when the network quality represented by the second parameter value of the network KPI parameter is lower than the network quality represented by the first threshold, determining that quality of the home network is poor; wherein the determining, by using a first parameter value corresponding to a network KPI parameter of the target user within a second time period and that is collected by a collection device in a carrier network, a second parameter value corresponding to the network KPI parameter of the target user within the second time period in a home network comprises: determining the second parameter value based on the first parameter value and a baseline threshold of the network KPI parameter, wherein the baseline threshold is used to represent network quality of a network between the collection device and a connection location between the carrier network and the home network.