The present disclosure relates to cross-device interaction methods and terminal devices. In one example method, a first device determines that a user identity of the first device is the same as a user identity of a second device. The first device obtains a target user of a task being executed by the second device. The first device determines, based on the target user of the task being executed by the second device, that a target contact of an application currently used by the first device is the target user. The first device sends information to the target user.