Abstract: A disclosed information processing apparatus capable of modifying an operation of an execution program includes an instruction information receiving unit that receives instruction information from an execution environment; an instruction information interpreting unit that interprets a position and execution contents in a source program from the received instruction information; an instruction information executing unit that refers to debug information including a corresponding relationship between the source program and an execution program main body, specifies a position in the execution program main body, the position corresponding to the interpreted position in the source program, and modifies the specified position in the execution program main body based on the interpreted execution contents; and an execution program main body unit that starts execution of the execution program after processes of the instruction information receiving unit, the instruction information interpreting unit, and the instructio