<TABLE> <S> <C>

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

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             APR-01-1996             JUL-01-1996
<PERIOD-END>                               MAR-31-1996             JUN-30-1996             SEP-29-1996
<CASH>                                         137,100                 138,258                 143,791
<SECURITIES>                                   131,901                 142,690                 132,212
<RECEIVABLES>                                  179,702                 207,960                 227,784
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                               480,779                 509,957                 525,328
<PP&E>                                         152,943                 197,667                 244,170
<DEPRECIATION>                                  71,311                  85,075                  95,037
<TOTAL-ASSETS>                                 684,680                 759,225                 818,349
<CURRENT-LIABILITIES>                          353,229                 461,850                 539,114
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                         1,487                   1,493                   1,501
<OTHER-SE>                                     303,258                 269,362                 251,492
<TOTAL-LIABILITY-AND-EQUITY>                   684,680                 759,225                 818,349
<SALES>                                        114,188                 103,331                 128,696
<TOTAL-REVENUES>                               164,605                 159,323                 187,073
<CGS>                                            9,818                  11,753                  13,058
<TOTAL-COSTS>                                   43,227                  47,249                  48,981
<OTHER-EXPENSES>                               136,216                 145,029                 152,103
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               (851)                 (1,281)                 (1,941)
<INCOME-PRETAX>                               (12,244)                (30,848)                (14,293)
<INCOME-TAX>                                     3,133                   3,235                   2,802
<INCOME-CONTINUING>                           (15,377)                (34,083)                (17,095)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (15,377)                (34,083)                (17,095)
<EPS-PRIMARY>                                   (0.10)                  (0.23)                  (0.11)
<EPS-DILUTED>                                   (0.10)                  (0.23)                  (0.11)


</TABLE>