A processing apparatus comprising: a first semiconductor integrated circuit configured to: generate a second boot code by encrypting a first boot code, wherein the first boot code comprises a third boot code to be used by a second semiconductor integrated circuit and a fourth boot code to be used by a third semiconductor integrated circuit, and transmit, based on first route information indicating a delivery route of the second boot code, first data including the second boot code and the first route information to a first destination via a first network; the second semiconductor integrated circuit configured to: serve as the first destination and receive the first data via the first network, generate the first boot code by decrypting the second boot code, perform a boot process based on the third boot code comprised in the decrypted first boot code, identify, based on the first route information included in the first data, the third semiconductor integrated circuit which serves as a second destination, generate a fifth boot code by encrypting the fourth boot code comprised in the decrypted first boot code, and transmit second data including the fifth boot code to the third semiconductor integrated circuit via the first network; and the third semiconductor integrated circuit configured to: receive the second data via the first network, generate the fourth boot code by decrypting the fifth boot code, and perform a boot process based on the fourth boot code. a first semiconductor integrated circuit configured to: generate a second boot code by encrypting a first boot code, wherein the first boot code comprises a third boot code to be used by a second semiconductor integrated circuit and a fourth boot code to be used by a third semiconductor integrated circuit, and transmit, based on first route information indicating a delivery route of the second boot code, first data including the second boot code and the first route information to a first destination via a first network; generate a second boot code by encrypting a first boot code, wherein the first boot code comprises a third boot code to be used by a second semiconductor integrated circuit and a fourth boot code to be used by a third semiconductor integrated circuit, and transmit, based on first route information indicating a delivery route of the second boot code, first data including the second boot code and the first route information to a first destination via a first network; the second semiconductor integrated circuit configured to: serve as the first destination and receive the first data via the first network, generate the first boot code by decrypting the second boot code, perform a boot process based on the third boot code comprised in the decrypted first boot code, identify, based on the first route information included in the first data, the third semiconductor integrated circuit which serves as a second destination, generate a fifth boot code by encrypting the fourth boot code comprised in the decrypted first boot code, and transmit second data including the fifth boot code to the third semiconductor integrated circuit via the first network; and the third semiconductor integrated circuit configured to: receive the second data via the first network, generate the fourth boot code by decrypting the fifth boot code, and perform a boot process based on the fourth boot code. serve as the first destination and receive the first data via the first network, generate the first boot code by decrypting the second boot code, perform a boot process based on the third boot code comprised in the decrypted first boot code, identify, based on the first route information included in the first data, the third semiconductor integrated circuit which serves as a second destination, generate a fifth boot code by encrypting the fourth boot code comprised in the decrypted first boot code, and transmit second data including the fifth boot code to the third semiconductor integrated circuit via the first network; and the third semiconductor integrated circuit configured to: receive the second data via the first network, generate the fourth boot code by decrypting the fifth boot code, and perform a boot process based on the fourth boot code. receive the second data via the first network, generate the fourth boot code by decrypting the fifth boot code, and perform a boot process based on the fourth boot code.