Method for acquiring logs for program debugging

A log acquisition method is provided that allows a processing log of software to readily be acquired and reduces the man-hours needed for analyzing a bug. The log acquisition method is a method for acquiring a runtime log of a program 91 including a function (FuncAA), comprising the step of changing the address of the function (FuncAA) loaded to the address of a function (92) for log acquisition and selecting the function (Func AA), wherein the function (92) for log acquisition comprises the steps of: calling the function (Func AA) (96) the log of which is to be acquired to cause a predetermined process to be executed (97), receiving the result of the execution (98), and passing said result to said program 91 (101), recording given information when calling the address of the selected function (Func AA) (95, 100), and recording given information when receiving the result of the execution of the selected function (Func AA) (99, 100).