A method of analyzing chromosomal information of sample cells, including the steps of: randomly breaking a genome DNA from the sample cells to obtain DNA fragments of a certain size; sequencing the DNA fragments to obtain DNA sequences; strictly aligning resulting DNA sequences against a reference sequence of human genome to obtain information about location of the DNA sequences on specific chromosomes; determining a total number of resulting DNA sequences that are located at unique regions on a particular chromosome N; calculating a value ChrN% for chromosome N, wherein ChrN% = the total number of resulting DNA sequences located at the unique regions on chromosome N / a total number of resulting DNA sequences located at unique regions on all chromosomes; and determining whether there is a difference between the number of chromosomes in the sample cells and the number of chromosomes in standard cells based on the calculated value ChrN% and a reference value ChrN% for the standard cells, wherein the determination is performed by comparing a "z score_ChrN" against a reference Z value, wherein the z score ChrN = (the calculated ChrN% for the sample cells - a ChrN% mean value) / a ChrN% standard deviation, the ChrN% mean value determined based on ChrN% for at least 10 standard cellular samples, and the ChrN% standard deviation determined based on an average value of ChrN% mean values for at least 10 standard cellular samples, wherein the reference Z value = (ChrN% mean × 0.5 × X%) / ChrN % standard deviation, X being an integer between -100 and 100 inclusive, and wherein when an absolute value of the z score_ChrN is greater than or equal to 3 and reaches an absolute value of the Z reference value, it is determined that there is an X% difference between the number of chromosomes in the sample cells and that in the standard cells. randomly breaking a genome DNA from the sample cells to obtain DNA fragments of a certain size; sequencing the DNA fragments to obtain DNA sequences; strictly aligning resulting DNA sequences against a reference sequence of human genome to obtain information about location of the DNA sequences on specific chromosomes; determining a total number of resulting DNA sequences that are located at unique regions on a particular chromosome N; calculating a value ChrN% for chromosome N, wherein ChrN% = the total number of resulting DNA sequences located at the unique regions on chromosome N / a total number of resulting DNA sequences located at unique regions on all chromosomes; and determining whether there is a difference between the number of chromosomes in the sample cells and the number of chromosomes in standard cells based on the calculated value ChrN% and a reference value ChrN% for the standard cells, wherein the determination is performed by comparing a "z score_ChrN" against a reference Z value, wherein the z score ChrN = (the calculated ChrN% for the sample cells - a ChrN% mean value) / a ChrN% standard deviation, the ChrN% mean value determined based on ChrN% for at least 10 standard cellular samples, and the ChrN% standard deviation determined based on an average value of ChrN% mean values for at least 10 standard cellular samples, wherein the reference Z value = (ChrN% mean × 0.5 × X%) / ChrN % standard deviation, X being an integer between -100 and 100 inclusive, and wherein when an absolute value of the z score_ChrN is greater than or equal to 3 and reaches an absolute value of the Z reference value, it is determined that there is an X% difference between the number of chromosomes in the sample cells and that in the standard cells.