a buffer memory into which M (M≧2, M is integer) images are fetched and stored in response to a fetching instruction;

a recording medium to record the M images fetched into the buffer memory;

a first-file creator for creating in a data area of said recording medium a first file including said M images stored in said buffer memory, said first file being created by writing said M images stored in said buffer memory from said buffer memory directly into said first file created in said data area of said recording medium as a form of combined file;

a first-managing-information creator for creating first managing information that manages said first file;

a reader for reading out, from said recording medium, N (N<M, N is integer) of the M images from said first file stored in said data area of said recording medium based on said first managing information when a predetermined condition that said fetching instruction is not received is satisfied;

a second-file creator for creating in said data area a second file including said N images read out by said reader, said second file being created by transferring said N images read out from said first file stored in said recording medium from said first file to said second file as a form of divided file; and

a second-managing-information creator for creating in a managing area of said recording medium a second-file managing information that manages said second file.