15. The computer-readable recording medium which stores the program of claim 13 , wherein the control section obtains a sheet size of each page from the electronic data in the description language format and changes the threshold value in accordance with the maximum sheet size of the obtained sheet sizes in a case where it is determined that the description language format includes information that indicate sheet size of each page, based on the description language format discriminated by the language format discriminating section.
13. A computer-readable recording medium which stores a program, the program causing a computer to serve as: a language format discriminating section to discriminate a description language format of electronic data; and a control section to change a threshold value based on the description language format discriminated by the language format discriminating section, there being a common storage area wherein a plurality of areas coexist in accordance with the threshold value, the plurality of areas being used to generate and store a plurality of pieces of data that have different formats based on the electronic data.