A positioning apparatus, comprising: - a plurality of antennas (1a - 3a) configured to receive signals from GPS satellites and having a known distance between each pair of antennas among the plurality of antennas (1a - 3a); - positioning calculation devices (1b - 3b) configured to perform positioning for respective antennas (1a - 3a), respectively, to obtain positioning results indicating positions of the plurality of antennas (1a - 3a) and accuracy indices indicating accuracies of the positioning results; and - a determination device comprising: a determination unit configured to perform first determination of determining whether or not accuracies indicated by the accuracy indices of two antennas out of the plurality of antennas (1a - 3a) are each higher than an accuracy indicated by a threshold and second determination of determining whether or not an absolute value of the difference between a measured distance between the two antennas based on a difference between positioning results of the two antennas and an actual distance between the two antennas is smaller than a threshold, to thereby acquire a reliability index and a final positioning result in accordance with results of the first determination and the second determination; and an output signal generation unit configured to generate positioning information for controlling a human interface configured to notify a result in accordance with the final positioning result and the reliability index. - a plurality of antennas (1a - 3a) configured to receive signals from GPS satellites and having a known distance between each pair of antennas among the plurality of antennas (1a - 3a); - positioning calculation devices (1b - 3b) configured to perform positioning for respective antennas (1a - 3a), respectively, to obtain positioning results indicating positions of the plurality of antennas (1a - 3a) and accuracy indices indicating accuracies of the positioning results; and - a determination device comprising: a determination unit configured to perform first determination of determining whether or not accuracies indicated by the accuracy indices of two antennas out of the plurality of antennas (1a - 3a) are each higher than an accuracy indicated by a threshold and second determination of determining whether or not an absolute value of the difference between a measured distance between the two antennas based on a difference between positioning results of the two antennas and an actual distance between the two antennas is smaller than a threshold, to thereby acquire a reliability index and a final positioning result in accordance with results of the first determination and the second determination; and an output signal generation unit configured to generate positioning information for controlling a human interface configured to notify a result in accordance with the final positioning result and the reliability index. a determination unit configured to perform first determination of determining whether or not accuracies indicated by the accuracy indices of two antennas out of the plurality of antennas (1a - 3a) are each higher than an accuracy indicated by a threshold and second determination of determining whether or not an absolute value of the difference between a measured distance between the two antennas based on a difference between positioning results of the two antennas and an actual distance between the two antennas is smaller than a threshold, to thereby acquire a reliability index and a final positioning result in accordance with results of the first determination and the second determination; and an output signal generation unit configured to generate positioning information for controlling a human interface configured to notify a result in accordance with the final positioning result and the reliability index.