1. A signal detection apparatus comprising: a detection target candidate selection unit configured to select a particular detection target signal from among plural candidates of detection target signals that are possibly included in a received signal; a candidate signal calculation unit configured to calculate a cyclic autocorrelation value at a center coordinate point specified by at least a cyclic parameter and a shift parameter of the particular detection target signal; a common area calculation unit configured to calculate a cyclic autocorrelation value of each of (L−1) coordinate points belonging to a common area that is used commonly for different detection target signals; a test statistic calculation unit configured to calculate a test statistic of the particular detection target signal; and a signal determination unit configured to determine presence or absence of the particular detection target signal according to a comparison result between the test statistic and a threshold, wherein the test statistic calculation unit calculates the test statistic by using the cyclic autocorrelation value in each of the (L−1) coordinate points belonging to the common area as cyclic autocorrelation values in (L−1) coordinate points different from the center coordinate point in an area including the center coordinate point.