<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995             DEC-31-1994
<PERIOD-START>                             JAN-01-1996             JAN-01-1995             JAN-01-1994
<PERIOD-END>                               DEC-31-1996             DEC-31-1995             DEC-31-1994
<CASH>                                         226,508                 164,305                 132,283
<SECURITIES>                                    41,151                  98,685                  66,347
<RECEIVABLES>                                  215,928                 179,570                 137,798
<ALLOWANCES>                                    21,429                  12,854                   6,036
<INVENTORY>                                      3,678                   2,801                       0
<CURRENT-ASSETS>                               533,314                 472,616                 352,936
<PP&E>                                         293,318                 152,942                  98,315
<DEPRECIATION>                               (106,591)                (71,310)                (52,753)
<TOTAL-ASSETS>                                 881,998                 682,445                 447,769
<CURRENT-LIABILITIES>                          530,177                 309,022                 168,069
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                         1,508                   1,480                   1,422
<OTHER-SE>                                     323,796                 356,267                 267,978
<TOTAL-LIABILITY-AND-EQUITY>                   881,998                 682,445                 447,769
<SALES>                                        496,039                 458,284                 346,518
<TOTAL-REVENUES>                               727,849                 632,770                 451,969
<CGS>                                           46,786                  37,593                  24,494
<TOTAL-COSTS>                                  191,636                 129,133                  71,292
<OTHER-EXPENSES>                               604,230                 438,689                 303,448
<LOSS-PROVISION>                                14,983                   8,508                   3,837
<INTEREST-EXPENSE>                             (5,784)                 (2,522)                   (551)
<INCOME-PRETAX>                               (61,034)                  70,694                  77,543
<INCOME-TAX>                                    12,531                  32,094                  29,250
<INCOME-CONTINUING>                           (73,565)                  38,600                  48,293
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (73,565)                  38,600                  48,293
<EPS-PRIMARY>                                   (0.49)                    0.27                    0.35
<EPS-DILUTED>                                   (0.49)                    0.26                    0.34


</TABLE>