A method for detection of two or more target nucleic acids in a sample, comprising: preparing a solid phase comprising detection probes respectively having certain different base sequences; carrying out PCR on the sample to obtain chimeric DNAs each having a label and a tag sequence complementary to each of the detection probes having been correlated to the target nucleic acids; bringing the chimeric DNAs into contact with the detection probes such that the chimeric DNAs and the detection probes can hybridize through the tag sequences; obtaining signal intensity information based on the label on the solid phase; and detecting the target nucleic acids based on the signal intensity information wherein the target sequences of the target nucleic acids are selected from characteristic sequences which have base sequences genetically indicative for constitution or disease incidence, disease diagnosis, disease prognosis, drug or treatment selection of specific diseases such as genetic diseases or cancer in human or non-human animals and base sequences which are derived from microorganisms such as pathogens and viruses and wherein the target sequences do not contain polymorphisms and the step of PCR comprises: preparing first primers having identification sequences complementary to each of the target sequences in the target nucleic acids and tag addition sequences complementary to the tag sequences and a second primer having a partial sequence identical to a partial sequence adjacent to the target sequence and the label, carrying out PCR on the sample using the first primers and the second primer to synthesize the chimeric DNAs having a target sequence, a tag sequence and the label; and wherein the step of PCR is the step of using, for two or more target nucleic acids, two or more first primers and one second primer common to the two or more target nucleic acids. preparing a solid phase comprising detection probes respectively having certain different base sequences; carrying out PCR on the sample to obtain chimeric DNAs each having a label and a tag sequence complementary to each of the detection probes having been correlated to the target nucleic acids; bringing the chimeric DNAs into contact with the detection probes such that the chimeric DNAs and the detection probes can hybridize through the tag sequences; obtaining signal intensity information based on the label on the solid phase; and detecting the target nucleic acids based on the signal intensity information wherein the target sequences of the target nucleic acids are selected from characteristic sequences which have base sequences genetically indicative for constitution or disease incidence, disease diagnosis, disease prognosis, drug or treatment selection of specific diseases such as genetic diseases or cancer in human or non-human animals and base sequences which are derived from microorganisms such as pathogens and viruses and wherein the target sequences do not contain polymorphisms and the step of PCR comprises: preparing first primers having identification sequences complementary to each of the target sequences in the target nucleic acids and tag addition sequences complementary to the tag sequences and a second primer having a partial sequence identical to a partial sequence adjacent to the target sequence and the label, carrying out PCR on the sample using the first primers and the second primer to synthesize the chimeric DNAs having a target sequence, a tag sequence and the label; and wherein the step of PCR is the step of using, for two or more target nucleic acids, two or more first primers and one second primer common to the two or more target nucleic acids. preparing first primers having identification sequences complementary to each of the target sequences in the target nucleic acids and tag addition sequences complementary to the tag sequences and a second primer having a partial sequence identical to a partial sequence adjacent to the target sequence and the label, carrying out PCR on the sample using the first primers and the second primer to synthesize the chimeric DNAs having a target sequence, a tag sequence and the label; and wherein the step of PCR is the step of using, for two or more target nucleic acids, two or more first primers and one second primer common to the two or more target nucleic acids.