According to an embodiment, an information processing device includes a memory and processing circuitry. The processing circuitry is configured to acquire a captured image; detect a plurality of targets included in the captured image; calculate target information representing at least one of a state or an attribute and reliability of the target information for each of the plurality of detected targets on the basic of the captured image; and estimate a distribution of the target information of the plurality of targets on the basis of a distribution of the target information of targets for which the reliability is higher than a set value.