INFORMATION PROCESSING SYSTEM AND PROGRAM MIGRATION METHOD

A first executing unit executes a first program by emulating information processing in a first operational environment in which the first program is executable. A generating unit generates, in parallel with the execution of the first program, a second program which is executable in a second operational environment of an information processing system and which is capable of acquiring the same processing result as the first program. A second executing unit terminates the execution of the first program by the first executing unit and also executing the second program, after the generation of the second program is completed.