1. A cloud server, comprising: a memory configured to store first-user-uploaded data received from a first user; a control unit configured to: determine one or more Social Network Services (SNSs) of at least one second user from a plurality of network services associated with the first-user-uploaded stored in the memory; transform the first-user-uploaded data based on properties of the determined one or more SNSs; and link the transformed first-user-uploaded data with at least one user account of the at least one second user on the determined one or more SNSs to provide the transformed first-user-uploaded data; and a transmission unit configured to transmit a data upload notification message to the at least one second user according to the linking of the transformed first-user-uploaded data with the at least one user account of the at least one second user, wherein the control unit is further configured to determine to upload the transformed first-user-uploaded data to the at least one user account of the at least one second user based on whether or not the at least one second user accepts the data upload notification message, wherein the first-user-uploaded data is associated with the at least one user account of the at least one second user based on user-defined criteria, and wherein the user-defined criteria comprises a relationship set by using statistics or a log.