Abstract: A computer system analysis device (100) has an alternative system (7b) for monitoring a computer system (7a) to be analyzed. The operation flow is switched from the system (7a) to the alternative system (7b) when a system failure of the system (7a) happens. A data searching section (10) fetches data value stored in a crash dump file (8b), a device file (8c), and the like as data collection files by using address data obtained from a kernel load module file (8a) corresponding to data items of a system failure requested by an input/output section (9) through which an operator requests to the device (100) to display data items and values thereof stored in the data collection files. The input/output section (9) receives the data items and values thereof from the data searching section (10) and displays them per page. The systems (7a, 7b) are made up of different processor systems, respectively.