To provide a technique for copying with program fault more accurate than before at a low cost on the basis of the record of the operation sequence of a program.

This information processor (1) is provided with a control part (2) for performing the program (11) outputting log information (13) regarding its own operation, a fault information storage part (14) storing fault information including the operation sequence of the program causing a fault and the cause of the fault or a method for coping with the fault and a fault information retrieval part (12) for reading the log information (13) outputted by the program (11), comparing the operation sequence of the program (11) indicated by the log information (13) with the operation sequence included in the fault information and presenting the matching fault information.