1. A method for managing a context in a communication system, the method comprising: detecting a packet transmitted between a device, to which a new temporary identifier is assigned, and a server; transmitting, to a device profile database, a request message for requesting information for an old temporary identifier of the device; receiving, from the device profile database, a response message including the information for the old temporary identifier of the device; and managing a context of the device by mapping the old temporary identifier of the device to the new temporary identifier of the device without a user identification of the device, the context comprising at least one of user activity information and user service usage information.