Provided is a method and apparatus for managing energy consumption in a home network system including multiple home devices. The method includes collecting measurement results of power consumptions of the respective multiple home devices, generating power consumption information of the multiple home devices by analyzing the collected measurement results, and transmitting the generated power consumption information to a user device if receiving a request for transmitting the power consumption information from the user device, in which the power consumption information comprises in-home room-specific power consumption information.