An apparatus includes a first-processor, and a programmable integrated circuit coupled to the first-processor; a second-processor, and a memory coupled to the second-processor, the second-processor being configured to access the first-processor; and a third-processor to manage the first-processor, wherein the first-processor is configured to write, to the rewritable-integrated circuit, a computation circuit to perform computation according to information from the second-processor, and an encryption circuit to generate encrypted data by encrypting a computation result computed by the computation circuit, by using an encryption key for the computation circuit, the third-processor is configured to manage the encryption key in association with the computation circuit and notify the second-processor of the encryption key for the computation circuit, and the second-processor is configured to read out the encrypted data from the memory for storing the encrypted data, and decrypt the read encrypted data by using the
