An information management system comprising: a reception device including a camera that images a face of a participant participating in an event; and an information management apparatus that is communicably connected to the reception device and manages information about the participant, wherein the information management apparatus includes at least one first processor, and the first processor is configured to receive an issuing request transmitted from the reception device for a digital key assigned to each participant, issue the digital key independently of personal information of the participant, transmit the issued digital key to the reception device, in a case where the reception device outputs an ID image of the participant that includes a face image representing the face of the participant imaged by the reception device and the digital key received by the reception device and is issued for each participant, acquire the face image from the reception device, store the face image and the digital key in a database in association with each other, and in a case where information including the digital key is received from a plurality of reading devices that are installed in an event venue and read the digital key included in the ID image, store the received information in the database in association with the digital key as behavior information representing a behavior of the participant in the event venue. a reception device including a camera that images a face of a participant participating in an event; and an information management apparatus that is communicably connected to the reception device and manages information about the participant, wherein the information management apparatus includes at least one first processor, and the first processor is configured to receive an issuing request transmitted from the reception device for a digital key assigned to each participant, issue the digital key independently of personal information of the participant, transmit the issued digital key to the reception device, in a case where the reception device outputs an ID image of the participant that includes a face image representing the face of the participant imaged by the reception device and the digital key received by the reception device and is issued for each participant, acquire the face image from the reception device, store the face image and the digital key in a database in association with each other, and in a case where information including the digital key is received from a plurality of reading devices that are installed in an event venue and read the digital key included in the ID image, store the received information in the database in association with the digital key as behavior information representing a behavior of the participant in the event venue. receive an issuing request transmitted from the reception device for a digital key assigned to each participant, issue the digital key independently of personal information of the participant, transmit the issued digital key to the reception device, in a case where the reception device outputs an ID image of the participant that includes a face image representing the face of the participant imaged by the reception device and the digital key received by the reception device and is issued for each participant, acquire the face image from the reception device, store the face image and the digital key in a database in association with each other, and in a case where information including the digital key is received from a plurality of reading devices that are installed in an event venue and read the digital key included in the ID image, store the received information in the database in association with the digital key as behavior information representing a behavior of the participant in the event venue.