A cell measurement method, wherein the method comprises: sending, by a first access network device, first measurement control information to a terminal device through a first serving cell, wherein the first measurement control information indicates the terminal device to measure quality of a downlink reference signal of a virtual cell, a center frequency of a downlink reference signal of the first serving cell is the same as a center frequency of the downlink reference signal of the virtual cell, a frequency range of the virtual cell is comprised in a frequency range of a second serving cell, and the frequency range of the second serving cell overlaps with a frequency range of the first serving cell; receiving, by the first access network device, a first measurement report from the terminal device, wherein the first measurement report indicates the quality of the downlink reference signal of the virtual cell; and migrating, by the first access network device, the terminal device to a third serving cell when the quality of the downlink reference signal of the virtual cell is higher than quality of the downlink reference signal of the first serving cell, wherein a communication standard supported by the second serving cell is different from a communication standard supported by the first serving cell, or a communication standard supported by the second serving cell is the same as a communication standard supported by the first serving cell and a center frequency of a downlink reference signal of the second serving cell is different from the center frequency of the downlink reference signal of the first serving cell; the virtual cell and the second serving cell are cells of the first access network device, or the virtual cell and the second serving cell are cells of a second access network device; and a communication standard supported by the third serving cell is the same as the communication standard supported by the first serving cell, and a center frequency of a downlink reference signal of the third serving cell is different from the center frequency of the downlink reference signal of the first serving cell, or a standard of the third serving cell is different from the standard of the first serving cell. sending, by a first access network device, first measurement control information to a terminal device through a first serving cell, wherein the first measurement control information indicates the terminal device to measure quality of a downlink reference signal of a virtual cell, a center frequency of a downlink reference signal of the first serving cell is the same as a center frequency of the downlink reference signal of the virtual cell, a frequency range of the virtual cell is comprised in a frequency range of a second serving cell, and the frequency range of the second serving cell overlaps with a frequency range of the first serving cell; receiving, by the first access network device, a first measurement report from the terminal device, wherein the first measurement report indicates the quality of the downlink reference signal of the virtual cell; and migrating, by the first access network device, the terminal device to a third serving cell when the quality of the downlink reference signal of the virtual cell is higher than quality of the downlink reference signal of the first serving cell, wherein a communication standard supported by the second serving cell is different from a communication standard supported by the first serving cell, or a communication standard supported by the second serving cell is the same as a communication standard supported by the first serving cell and a center frequency of a downlink reference signal of the second serving cell is different from the center frequency of the downlink reference signal of the first serving cell; the virtual cell and the second serving cell are cells of the first access network device, or the virtual cell and the second serving cell are cells of a second access network device; and a communication standard supported by the third serving cell is the same as the communication standard supported by the first serving cell, and a center frequency of a downlink reference signal of the third serving cell is different from the center frequency of the downlink reference signal of the first serving cell, or a standard of the third serving cell is different from the standard of the first serving cell.