A method for providing a unified service in a ubiquitous network and a unified service platform. The unified service platform receives service download requests of users in different heterogeneous networks, and selects service providing networks and terminals according to context information contained in the service download requests. When receiving service data provided by the service providing networks and the terminals, the unified service platform processes the received service data, forms service data requested by the users for downloading, and provides the service data to the users. By means of embodiments of the present invention, devices, services and network resources in a network can be fully utilized, thereby implementing rapid providing of different service requirements of different users.