An apparatus and a method for managing a storage space through time-variant consumption estimation. More particularly, an apparatus and a method for managing a storage space through time-variant consumption estimation that estimates consumption of an entire storage space when a user instructs program editing, program recording or reserved recording, and so on. When there is a possibility that the estimated consumption exceeds a predetermined value, immediately providing a user with information indicating that the storage space is lacking. The apparatus includes a storage unit storing contents in the storage space, a consumption estimation unit estimating time-variant consumption of the storage space, a contents management unit deleting at least a portion of the contents or storing at least a portion of additionally input contents according to the estimation result, and an output unit outputting the deletion or storage result.