Provided is a method of providing an integrate cloud storage service through a home gateway communicating with smart devices through a first network formed by the home gateway and communicating with cloud storages through a communication network. The method may include obtaining information on cloud storage accounts associated with a smart device, as cloud storage account information, upon generation of a predetermined event associated with the smart device, generating an integrated cloud storage list based on information on folders and data of cloud storages accessible by the cloud storage account information, and providing the generated integrated cloud storage list to the smart device.