Ok, I have found the meaning of Sever Condition 
It means that:
In the case of light car , 10,000km ( turbo cars 5,000km), or let's exchange once every six months .
Severe condition : 5,000km in the case of ( turbo cars 2,500km) is a measure of each exchange . In addition , once the exchange twice of engine oil is recommended to replace the oil filter .
※ severe condition : rough road often , traveling distance is large, if you use in harsh conditions , such as frequent traveling up and down like mountain road .