3. A troubleshooting support device according to claim 1 , further comprising: an extraction range setting unit that sets a range over which logs are to be extracted from each category-specific log file based upon extraction range information input via said input unit, wherein: said analysis log file creation unit extracts and incorporates said logs in said extraction range having been set from said category-specific log file having been selected to create an analysis log file by sorting the logs in time sequence.
3. A troubleshooting support device according to claim 1 , further comprising: an extraction range setting unit that sets a range over which logs are to be extracted from each category-specific log file based upon extraction range information input via said input unit, wherein: said analysis log file creation unit extracts and incorporates said logs in said extraction range having been set from said category-specific log file having been selected to create an analysis log file by sorting the logs in time sequence. 4. A troubleshooting support device according to claim 3 , wherein: each log in said category-specific log files includes date/time information; and said extraction range information input via said input unit to be used at said extraction range setting unit defines said extraction range based upon, for instance, specific dates/times.