Provided are a method and apparatus for allocating a storage space that is to be used by a plurality of modules sequentially processing data. The method includes acquiring first capacity information regarding the capacity of a storage space needed for data processing of a first module and second capacity information regarding the capacity of a storage space needed for data processing of a second module that processes data consecutively to the first module, and allocating a first storage space to be used by both the first module and the second module based on at least one of the first capacity information and the second capacity information.