A data update method, wherein the method is applied to an embedded universal integrated circuit card eUICC in which a management apparatus and at least one secure element SE are disposed, wherein the at least one SE is configured to store an application corresponding to at least one profile, and the management apparatus is configured to manage the at least one SE, wherein the at least one secure element SE is at least one public SE, wherein a public SE is space in the eUICC, other than a storage module, that is used to store and run an application corresponding to a profile in the storage module, and the at least one public SE is configured to store at least an application corresponding to the source profile and an application corresponding to the target profile; and the method comprises: receiving, by the management apparatus, a profile enabling request, wherein the profile enabling request is used to switch a source profile to a target profile, the profile enabling request comprises identifier information of the target profile, and the source profile is a profile that is in an enabled state before the switching; and updating, by the management apparatus, a first correspondence to a second correspondence according to the profile enabling request, wherein the first correspondence is a correspondence between a first application set and the source profile, and the first application set comprises at least one application in the at least one SE; and the second correspondence is a correspondence between a second application set and the target profile, and the second application set comprises at least one application in the first application set; and wherein the updating, by the management apparatus, a first correspondence to a second correspondence according to the profile enabling request specifically comprises: selecting, by the management apparatus, at least one application from the first application set according to the identification information of the target profile or according to the identification information of the target profile and a user indication; and obtaining, by the management apparatus, an identifier of the selected at least one application from the first correspondence, and associating the identifier of the at least one application with the identification information of the target profile, to obtain the second correspondence. receiving, by the management apparatus, a profile enabling request, wherein the profile enabling request is used to switch a source profile to a target profile, the profile enabling request comprises identifier information of the target profile, and the source profile is a profile that is in an enabled state before the switching; and updating, by the management apparatus, a first correspondence to a second correspondence according to the profile enabling request, wherein the first correspondence is a correspondence between a first application set and the source profile, and the first application set comprises at least one application in the at least one SE; and the second correspondence is a correspondence between a second application set and the target profile, and the second application set comprises at least one application in the first application set; and wherein the updating, by the management apparatus, a first correspondence to a second correspondence according to the profile enabling request specifically comprises: selecting, by the management apparatus, at least one application from the first application set according to the identification information of the target profile or according to the identification information of the target profile and a user indication; and obtaining, by the management apparatus, an identifier of the selected at least one application from the first correspondence, and associating the identifier of the at least one application with the identification information of the target profile, to obtain the second correspondence. selecting, by the management apparatus, at least one application from the first application set according to the identification information of the target profile or according to the identification information of the target profile and a user indication; and obtaining, by the management apparatus, an identifier of the selected at least one application from the first correspondence, and associating the identifier of the at least one application with the identification information of the target profile, to obtain the second correspondence.