The present invention relates to an apparatus and method for the reserved transmission of non-real-time content in a heterogeneous network environment. The method for the reserved transmission of non-real-time content in a heterogeneous network environment, in which a plurality of networks performing data communication with a mobile terminal coexist, includes the steps of: receiving the input of a transmission reservation option from either a mobile terminal user or a server operator; the mobile terminal collecting information on accessible networks and data transmission rate; scheduling the transmission data over currently accessible networks on the basis of the received transmission reservation option, the collected information on the accessible networks, and the data transmission rate; and repeating data transmission according to the scheduling until the transmission of the content is completed.