CPU overloading problem

Hello everyone.
I'm running Oracle 10 and Apache on the same machine. Recently the CPU load average became critical and I wonder is there a way to optimize Oracle/Apache performance. I have about 4000 visitors a day on the website and there seems to be no DDOS attacks or visitors' number increases.
Can anyone please help me with an advice?
Here are some figures...
13:36:43 up 297 days, 6 min, 1 user, load average: 5.27, 5.69, 8.09
346 processes: 339 sleeping, 7 running, 0 zombie, 0 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 87.8% 0.0% 7.8% 0.2% 1.3% 1.6% 1.0%
cpu00 88.6% 0.0% 8.5% 0.0% 0.1% 0.3% 2.1%
cpu01 85.7% 0.0% 9.5% 0.0% 1.1% 2.7% 0.7%
cpu02 91.4% 0.0% 4.3% 0.9% 2.3% 0.1% 0.5%
cpu03 85.5% 0.0% 9.1% 0.0% 1.5% 3.1% 0.5%
Mem: 2061612k av, 2026372k used, 35240k free, 0k shrd, 6568k buff
1455500k actv, 179304k in_d, 30584k in_c
Swap: 2061604k av, 1030800k used, 1030804k free 325272k cached

Hello, thanks for the reply.
The top of the list looks like this:
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
7359 mysite 25 0 63604 15M 5784 R 17.9 0.7 0:04 2 httpd
7364 mysite 23 0 63180 15M 5716 R 11.9 0.7 0:02 3 httpd
2867 mysite 17 0 63020 12M 4924 R 9.6 0.6 0:07 1 httpd
7366 oracle 24 0 59320 57M 57136 S 5.1 2.8 0:01 1 oracle
7358 oracle 20 0 58096 55M 55916 S 4.0 2.7 0:00 2 oracle
12 root 15 0 0 0 0 SW 0.3 0.0 113:23 1 kscand
7351 mysite 23 0 63404 15M 5784 S 0.3 0.7 0:02 0 httpd
7236 mysite 16 0 1488 1488 912 R 0.2 0.0 0:00 0 top
28 root 15 0 0 0 0 SW 0.1 0.0 58:16 0 kjournald
1 root 19 0 504 476 452 S 0.0 0.0 28:00 1 init
2 root RT 0 0 0 0 SW 0.0 0.0 0:00 0 migration/0
3 root RT 0 0 0 0 SW 0.0 0.0 0:00 1 migration/1
4 root RT 0 0 0 0 SW 0.0 0.0 0:00 2 migration/2
5 root RT 0 0 0 0 SW 0.0 0.0 0:00 3 migration/3
6 root 15 0 0 0 0 SW 0.0 0.0 0:00 3 keventd
7 root 34 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd/0
8 root 34 19 0 0 0 SWN 0.0 0.0 0:00 1 ksoftirqd/1
9 root 34 19 0 0 0 SWN 0.0 0.0 0:00 2 ksoftirqd/2
10 root 34 19 0 0 0 SWN 0.0 0.0 0:00 3 ksoftirqd/3

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