To provide a semiconductor testing system capable of keeping confidentiality of test programs and test data.

A semiconductor testing system tests a target device on the basis of a test program and manages test data obtained from the test. The system includes: a semiconductor testing device which decrypts an encrypted test program with the use of a password, conducts a test on the target device on the basis of the decrypted test program, and encrypts and transmits test data obtained from the test with the use of a password; and a mass-produced server which issues passwords, encrypts a test program with the use of a password, transmits the encrypted test program to the semiconductor testing device, and decrypts encrypted test data received from the semiconductor testing device with the use of a password.