A computer system comprises, a profile for each software module, a software module monitor which detects a failure as failure occurrence information at an early stage at a time of execution of an application based on execution related information recorded in the profile, and notifies a software module manager of the failure, and the software module manager which identifies a failed software module from the failure occurrence information, determines how to handle the software module on the basis of the execution related information and the failure occurrence information, and directs the execution.