Information provision method and information processing device

Abstract

An information provision method is executed by an information processing device that: obtains attack information through communication with a security monitoring device that determines presence or absence of an attack based on log information obtained from a vehicle; and provides countermeasure information to a passenger inside the vehicle or a person outside the vehicle. The information provision method includes: receiving, from the security monitoring device, attack information including a threat level of an attack on a vehicle and vehicle information for identifying the vehicle in association with each other; and transmitting, to the vehicle identified by the vehicle information, an instruction that causes a presenter included in the vehicle to present countermeasure information determined depending on the threat level, the countermeasure information presented by the presenter being information that prompts a passenger inside the vehicle or a person outside the vehicle to act to avoid an impact of the attack.