An information processing device (10, 110) comprising: a storage configured to store an electronic certificate used for authentication for using a first network; a detector (20, 120) configured to detect at least one of whether a time to renew the electronic certificate has arrived and whether the electronic certificate is stored in the storage and is valid; and a communication unit having a first communication mode in which the communication unit communicates with an external device via the first network and a second communication mode in which the communication unit operates as a wireless access point and communicates with a certificate renewal device (16, 60) via a wireless network (NT4, NT5), wherein the communication unit performs at least one of: when the detector (20, 120) detects that the time to renew the electronic certificate has arrived, transmitting a service set identifier of the information processing device (10, 110) as a request for an electronic certificate used for the authentication for using the first network to the certificate renewal device (16, 60) in the second communication mode and receiving, as an electronic certificate for renewing the electronic certificate, an electronic certificate transmitted from the certificate renewal device (16, 60) in response to the service set identifier, and when the detector (20, 120) detects that the electronic certificate is not stored in the storage or invalid, transmitting a service set identifier of the information processing device (10, 110) as a request for an electronic certificate used for the authentication for using the first network to the certificate renewal device (16, 60) in the second communication mode and receiving, as a new electronic certificate, an electronic certificate transmitted from the certificate renewal device (16, 60 in response to the service set identifier. a storage configured to store an electronic certificate used for authentication for using a first network; a detector (20, 120) configured to detect at least one of whether a time to renew the electronic certificate has arrived and whether the electronic certificate is stored in the storage and is valid; and a communication unit having a first communication mode in which the communication unit communicates with an external device via the first network and a second communication mode in which the communication unit operates as a wireless access point and communicates with a certificate renewal device (16, 60) via a wireless network (NT4, NT5), wherein the communication unit performs at least one of: when the detector (20, 120) detects that the time to renew the electronic certificate has arrived, transmitting a service set identifier of the information processing device (10, 110) as a request for an electronic certificate used for the authentication for using the first network to the certificate renewal device (16, 60) in the second communication mode and receiving, as an electronic certificate for renewing the electronic certificate, an electronic certificate transmitted from the certificate renewal device (16, 60) in response to the service set identifier, and when the detector (20, 120) detects that the electronic certificate is not stored in the storage or invalid, transmitting a service set identifier of the information processing device (10, 110) as a request for an electronic certificate used for the authentication for using the first network to the certificate renewal device (16, 60) in the second communication mode and receiving, as a new electronic certificate, an electronic certificate transmitted from the certificate renewal device (16, 60 in response to the service set identifier. when the detector (20, 120) detects that the time to renew the electronic certificate has arrived, transmitting a service set identifier of the information processing device (10, 110) as a request for an electronic certificate used for the authentication for using the first network to the certificate renewal device (16, 60) in the second communication mode and receiving, as an electronic certificate for renewing the electronic certificate, an electronic certificate transmitted from the certificate renewal device (16, 60) in response to the service set identifier, and when the detector (20, 120) detects that the electronic certificate is not stored in the storage or invalid, transmitting a service set identifier of the information processing device (10, 110) as a request for an electronic certificate used for the authentication for using the first network to the certificate renewal device (16, 60) in the second communication mode and receiving, as a new electronic certificate, an electronic certificate transmitted from the certificate renewal device (16, 60 in response to the service set identifier.