<TABLE> <S> <C>

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

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1999             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               DEC-31-1999             DEC-31-1998             DEC-31-1997
<CASH>                                         140,371                 185,459                 141,559
<SECURITIES>                                    88,746                  41,093                  16,069
<RECEIVABLES>                                  245,456                 202,431                 169,159
<ALLOWANCES>                                    13,278                  15,089                  27,104
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                               491,106                 437,522                 338,196
<PP&E>                                         247,764                 254,157                 263,544
<DEPRECIATION>                                 187,178                 178,312                 167,119
<TOTAL-ASSETS>                                 646,212                 622,065                 566,021
<CURRENT-LIABILITIES>                          332,286                 406,262                 476,999
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                         2,073                   1,913                   1,545
<OTHER-SE>                                     310,433                 210,131                  59,217
<TOTAL-LIABILITY-AND-EQUITY>                   646,212                 622,065                 566,021
<SALES>                                        442,829                 383,947                 378,164
<TOTAL-REVENUES>                               871,536                 735,506                 663,892
<CGS>                                           43,097                  35,446                  63,027
<TOTAL-COSTS>                                  216,761                 191,393                 229,943
<OTHER-EXPENSES>                               556,262                 490,827                 793,402
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               4,316                   5,849                   9,405
<INCOME-PRETAX>                                 10,717                  54,584               (352,571)
<INCOME-TAX>                                    21,881                   4,400                   7,817
<INCOME-CONTINUING>                           (11,164)                  50,184               (360,388)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (11,164)                  50,184               (360,388)
<EPS-BASIC>                                     (0.06)                    0.26                  (2.37)
<EPS-DILUTED>                                   (0.06)                    0.25                  (2.37)


</TABLE>