1, A data processing apparatus, wherein: • ■ where code bits of an LDPC (Low Density Parity Check) code having a code length of N bits are written in a column direction of storage means for storing the code bits in a row direction and the column direction and m bits of the code bits of the LDPC code read out in the row direction are set as one symbols and besides
a predetermined positive integer is represented by b,
said storage means stores mb bits in the row direction and stores N/(mb) bits in the column direction;
the code bits of the LDPC code being written in the column direction of said storage means and read out in the row direction;
said data processing apparatus comprising "™" replacement means' fox -replacing, -
where the mb code bits read out in the row direction of said storage means set as b symbols?
the mb code bits such that the code bits after the replacement form the symbol bits representative of the symbols;
the LDPC code being an LDPC code which is prescribed in the DVB-S.2 or DVB-T.2 standard and which

has a code length N of 64,800 bits and has an encoding rate of 2/3;
the m bits being 8 bits while-"the integer b is 2;
the 8 bits of the code bit being mapped as one symbol to ones of 256 signal points prescribed in 256QAM;
said storage means having 16 columns for storing 8 * 2 bits in the row direction and storing 64^800/(8 x 2) bits in the column direction;
said replacement means carrying out,
where the i+lth bit from the most significant bit of the 8*2 code bits read out in the row direction of said storage means is represented as bit bi and the i+lth bit from the most significant bit of the 8 * 2 symbol bits of successive two. symbols is represented as bit yi,
replacement"for allocating
the bit b0 to the bit yjs,
" the bit bi to 'the- brl"^;' - ;
the bit b2 to the bit yi,
the bit hz to the bit y5?
the bit b4 to the bit ye, . .
the bit b5 to the bit y^
the bit bs to the bit yn,
the bit b7 to the bit y§?
the bit b8 to the bit y§?

the bit bg to the bit y14,
the bit bio to the bit y12?
the bit bn to the'bit y3p ' —
the bit bi2 to the bit yc^
the bit bis to the bit yi0,
the bit bi4 to the bit y4, and
the bit b^ to the bit y2»
2, A data processing methods wherein^
where code bits of an LDPC (Low Density Parity Check) code having a code length of N bits are written in a column direction of storage means for storing the code bits in a row direction and the column direction and m bits of the code bits of the LDPC code read out in the row direction are set as one symbol^ and besides
a predetermined positive integer is represented by b,
said storage means-'3t-ores~Tmb"bi"ts in the row direction and stores N/(mb) bits in the column direction;
the code bits of the LDPC code being written in the column direction of said storage means and read out in the row direction;
said data processing apparatus comprising a replacement step for replacing^
where the mb code bits read out in the row

direction of said storage means set as b symbols,
the mb code bits such that the code bits after the ■ replacement form the symbol bits representative of -the symbols;
the LDPC code being an LDPC code which is prescribed in the DVB-Sa2 or DVB-T.2 standard and which has a code length N of 64f800 bits and has an encoding rate of 2/3;
the m bits being 8 bits while the integer b is 2;
the 8 bits of the code bit being mapped as one symbol to ones of 256 signal points prescribed in 256QAM;
said storage means having 16 columns for storing 8 x 2 bits in the row direction and storing 64^800/(8 x 2) bits in the column direction;
said replacement step carrying out,
where the i+lth bit from the most significant bit of the 8^2 code bits read out irr threrow direction-of said storage means is represented as bit bi and the i+lth bit from the most significant bit of the 8 x 2 symbol bits of two successive symbols is represented as bit yif
replacement for allocating
the bit ba to the bit y15,
the bit bi to the bit V7,
the bit b2 to the bit y^.

the bit b3 to the bit ys,
the bit b4 to the bit y6,
the bit b& to the bit yi3,
tlie bit bg to the bit yu,
the bit hi to the bit yg,
the bit be to the bit y$,
the bit bg to the bit yu,
the bit bio to the bit yi2r
the bit bn to the bit y3,
the bit bi2 to the bit y0,
the bit bi3 to the bit yio,
the bit bn to the bit y4, and
the bit bis to the bit y2.
3. An encoding apparatus for carrying out encoding by an LDPC {Low Density Parity Check) codef comprising^
encoding means for carrying out encoding by an LDPC 'code which has a code length of 64p 800 "bits -and' an encoding rate of 2/3;
a parity check matrix of the LDPC code being configured such that elements of the value 1 of an information matrix,, which corresponds to the code length of the parity check matrix and an information length corresponding to the encoding rate, decided by a parity check matrix initial value table representative of the

positions of the elements of the value 1 of the information matrix are arranged in a period of every 360 columns in the column direction;
the parity check matrix initial value table being formed from
317 2255 2324 2723 3538 3576 6194 6700 9101 10057 12739 17407 21039
1958 2007 3294 4394 12762 14505 14593 14692 16522 17737 19245 21272 21379
127 860 5001 5633 8644 9282 12690 14644 17553 19511 19681 20954 21002
2514 2822 5781 6297 8063 9469 9551 11407 11837 12985 15710 20236 20393
1565 3106 4659 4926 6495 6872 7343 8720 15785 16434 16727 19884 21325
706 3220 8568 10896 12486 13663 16398 16599 19475 19781
20625 20961 21335 -—-
4257 10449 12406 14561 16049 16522 17214 18029 18033 18802 19062 19526 20748
412 433 558 2614 2978 4157 6584 9320 11683 11819 13024 14486 16860
777 5906 7403 8550 8717 8770 11436 12846 13629 14755 15688 16392 16419 4093 5045 6037 7248 8633 9771 10260 10809 11326 12072

17516 19344 19938
2120 2648 3155 3852 6888 12258 14821 15359 16378 16437
17791 20614 21025
1085 2434 5816 7151 8050 9422 10884 12728 15353 17733
18140 18729 20920
856 1690 12787
6532 7357 9151
4210 16615 18152
11494 14036 17470
2474 10291 10323
1778 6973 10739
4347 9570 18748
2189 11942 20666
3868 7526 17706
8780 14796 18268
160 16232 17399
1285 2003 18922 . -. ..
4658 17331 20361
2765 4862 5875
4565 5521 8759
3484 7305 15829
5024 17730 17879
7031 12346 15024
179 6365 11352

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10084 12411 14432
1064 13555 17033 679 9878 13547 3422 9910 20194 3640 3701 10046 5862 10134 11498 5923 9580 15060 1073 3012 16427

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350 11659 18342 5961 14803 16123 2113 9163 13443 2155 9808 12885
7309 9220 20745 6834 8742 11977

2133 12908 14704 10170 13809 18153 13464 14787 14975 799 1107 3789 3571 8176 10165 5433 13446 15481 3351 6767 12B40 8950 8974 11650 1430 4250 21332 6283 10628 15050 8632 14404 16916 6509 10702 16278 15900 16395 17995 8031 18420 19733 3747 4634 17087 4453 6297 16262 2792 3513 17031 - ■ 14846 20893 21563 17220 20436 21337 275 4107 10497 3536 7520 10027 14089 14943 19455 1965 3931 21104 2439 1X565 17932

154 15279 21414 10017 11269 16546 7169 10161 16928 10284 16791 20655 36 3175 8475 2605 16269 19290 8947 9178 15420 5687 9156 12408 8096 9738 14711 4935 8093 19266 2667 10062 15972 6389 11318 14417 8800 18137 18434 5824 5927 15314 6056 13168 15179 3284 13138 18919 13115 17259 17332.
4. An encoding method for an encoding apparatus which carries out encoding by an LDPC {Low Density Parity Check) code,, comprising:
a step carried out by said encoding apparatus of carrying out encoding by an LDPC code which has a code length of 64?800 bits and an encoding rate of 2/3;
a parity check matrix of the LDPC code being

configured such that elements of the value 1 of an information matrix, which corresponds to the code length of the parity check matrix and an information length corresponding to the encoding rate? decided by a parity check matrix initial value table representative of the positions of the elements of the value 1 of the information matrix are arranged in a period of every 360 columns in the column direction;
the parity check matrix initial value table being formed from
317 2255 2324 2723 3538 3576 6194 6700 9101 10057 12739 17407 21039
1958 2007 3294 4394 12762 14505 14593 14692 16522 17737 19245 21272 21379
127 860 5001 5633 8644 9282 12690 14644 17553 19511 19681 20954 21002
2514 2822 5781 6297 8063 9469 9551 11407 11837 12985 15710 20236 20393
1565 3106 4659 4926 6495 6872 7343 8720 15785 16434 16727 19884 21325
706 3220 8568 10896 12486 13663 16398 16599 19475 19181 20625 20961 21335
4257 10449 12406 14561 16049 16522 17214 18029 18033 18802 19062 19526 20748

412 433 558 2614 2978 4157 6584 9320 11683 11819 13024 14486 16860
777 5906 7403 8550 8717 8770 11436 12846 13629 14755 15688 16392 16419
4093 5045 6037 7248 8633 9771 10260 10809 11326 12072 17516 19344 19938
2120 2648 3155 3852 6888 12258 14821 15359 16378 16437 17791 20614 21025
1085 2434 5816 7151 8050 9422 10884 12728 15353 17733 18140 18729 20920 856 1690 12787 6532 7357 9151 4210 16615 18152 11494 14036 17470 2474 10291 10323 1778 6973 10739 ■ 4347 9570 18748 2189 11942 20666 3868 7526 17706 8780 14796 18268 160 16232 17399 1285 2003 18922 4658 17331 20361 2765 4862 5875

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3422 9910 20194
3640 3701 10046
5862 10134 11498
5923 9580 15060
1073 3012 16427
5527 20113 20883
7058 12924 15151
9764 12230 17375
772 7711 12723
555 13816 15376
10574 11268 17932
15442 17266 20482
390 3371 8781
10512 12216 17180
4309 14068 15783
3971 11673 20009
9259 14270 17199 ■ -
2947 5852 20101
3965 9722 15363
1429 5689 16771
6101 6849 12781
3676 9347 18761
350 11659 18342
5961 14803 16123 ■ -

2113 9163 13443
2155 9808 12885
2861 7988 11031
7309 9220 20745
6834 8742 11977
2133 12908 14704
10170 13809 18153
13464 14787 14975
799 1107 3789
3571 8176 10165
5433 13446 15481
3351 6767 12840
8950 8974 11650
1430 4250 21332
6283 10628 15050
8632 14404 16916
6509 10702 16278 - '
15900 16395 17995
8031 18420 19733
3747 4634 17087
4453 6297 16262
2792 3513 17031
14846 208S3 21563
17220 20436 21337

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