An information processing apparatus includes a processor that receives a first event from a first sensor monitoring a first object and stores the first event in a first history. The processor generates and stores a second event in the first history repeatedly in absence of another event from the first sensor. The processor receives a third event from a second sensor monitoring a second object and stores the third event in a second history. The processor generates and stores a fourth event in the second history repeatedly in absence of another event from the second sensor. The processor calculates likelihood that the first object and the second object accompany each other based on the first history and the second history. The processor generates and outputs, when the likelihood exceeds a predetermined threshold value, information in which the first object and the second object are linked to each other.