An information processing method using an information processing device, which includes receiving an electric power feed request to a vehicle from a user terminal, determining an installer who installs a charger for power supply based on the electric power feed request, and determining a charging position. transmitting installation work information indicating at least the time of installation to the installer terminal; determining a person to remove the charger from the electric power feed request; and removing work information indicating at least the charging position and the removal time to the retriever terminal.