Server Load 41.07 (4 cpus)

Can anyone tell me what is "nice" and "system", It take all my CPU resource and what's wrong with my server ? It is a Dual Xeon

Code: 
459 processes: 451 sleeping, 8 running, 0 zombie, 0 stopped
CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
           total    0.0%   65.7%   22.9%   0.2%     2.3%    4.5%    4.0%
           cpu00    0.0%   61.2%   23.0%   0.1%     6.8%    4.7%    3.9%
           cpu01    0.3%   64.3%   26.1%   0.1%     0.3%    3.9%    4.5%
           cpu02    0.0%   68.1%   22.7%   0.0%     0.5%    5.5%    2.9%
           cpu03    0.0%   69.2%   19.6%   0.7%     1.5%    3.9%    4.7%
Mem:  2061552k av, 1781988k used,  279564k free,       0k shrd,  154656k buff
                   1184416k actv,   72020k in_d,   13668k in_c
Swap: 2048276k av,       0k used, 2048276k free                  639240k cached

 

 

 

 

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