An information processing device, comprising: a cause-and-effect model generator (114 to 116) configured to generate a plurality of cause-and-effect models between variables based on a relationship between a plurality of mechanisms in a production process of a production line, a dependency between a plurality of events associated with the plurality of mechanisms, or a control-based relationship between the plurality of mechanisms; an abnormality detector configured to obtain a result of abnormality detection in the production line; a contribution ratio calculator configured to calculate a contribution ratio of each variable of a plurality of variables contributing to abnormality in the result of abnormality detection; and an estimator configured to estimate an abnormality causal factor for at least one of the plurality of cause-and-effect models based on the calculated contribution ratios of the variables contributing to abnormality; characterized in that: the information processing device further comprises a display configured to display the abnormality causal factor estimated for the at least one of the plurality of cause-and-effect models based on a result of estimation obtained by the estimator; wherein the information processing device further comprises an event-related matter registration unit configured to register an event list for an abnormal event; wherein the event list includes pieces of information including: an event outline, event data of a generated event, the estimation result of the estimator, a confirmed event associated with the plurality of mechanisms, details of an event activity, and the contribution ratios of variables contributing to abnormality for said abnormal event; wherein the information processing device further comprises an event estimator configured to calculate a degree of similarity between the contribution ratios included in the event list and the calculated contribution ratios of the variables contributing to abnormality; and wherein the event estimator is configured to extract an event list with higher similarity between the contribution ratios and display the event list on the display. a cause-and-effect model generator (114 to 116) configured to generate a plurality of cause-and-effect models between variables based on a relationship between a plurality of mechanisms in a production process of a production line, a dependency between a plurality of events associated with the plurality of mechanisms, or a control-based relationship between the plurality of mechanisms; an abnormality detector configured to obtain a result of abnormality detection in the production line; a contribution ratio calculator configured to calculate a contribution ratio of each variable of a plurality of variables contributing to abnormality in the result of abnormality detection; and an estimator configured to estimate an abnormality causal factor for at least one of the plurality of cause-and-effect models based on the calculated contribution ratios of the variables contributing to abnormality; characterized in that: the information processing device further comprises a display configured to display the abnormality causal factor estimated for the at least one of the plurality of cause-and-effect models based on a result of estimation obtained by the estimator; wherein the information processing device further comprises an event-related matter registration unit configured to register an event list for an abnormal event; wherein the event list includes pieces of information including: an event outline, event data of a generated event, the estimation result of the estimator, a confirmed event associated with the plurality of mechanisms, details of an event activity, and the contribution ratios of variables contributing to abnormality for said abnormal event; wherein the information processing device further comprises an event estimator configured to calculate a degree of similarity between the contribution ratios included in the event list and the calculated contribution ratios of the variables contributing to abnormality; and wherein the event estimator is configured to extract an event list with higher similarity between the contribution ratios and display the event list on the display. the information processing device further comprises a display configured to display the abnormality causal factor estimated for the at least one of the plurality of cause-and-effect models based on a result of estimation obtained by the estimator; wherein the information processing device further comprises an event-related matter registration unit configured to register an event list for an abnormal event; wherein the event list includes pieces of information including: an event outline, event data of a generated event, the estimation result of the estimator, a confirmed event associated with the plurality of mechanisms, details of an event activity, and the contribution ratios of variables contributing to abnormality for said abnormal event; wherein the information processing device further comprises an event estimator configured to calculate a degree of similarity between the contribution ratios included in the event list and the calculated contribution ratios of the variables contributing to abnormality; and wherein the event estimator is configured to extract an event list with higher similarity between the contribution ratios and display the event list on the display.