An image processor (101; 101A) comprising: an image input section configured to receive image data output from an imaging unit for imaging a subject, the image data including the subject; a position information acquisition section (113; 113A) configured to acquire position information indicating a position of the image processor; an object recognition section configured to recognize the subject in the image data input from the image input section; an attention object list management section (121; 121A) configured to manage, for each position previously acquired by the position information acquisition section (113; 113A) upon receiving image data, a first attention object list including first attention object data indicating one or more attention object candidates selected from among subjects recognized in the image data that is previously received at the corresponding previously acquired position; an attention object identification section (119; 119A) configured to perform comparison processing of comparing the first attention object data, including one or more attention object candidates and previously acquired position information indicating a previously acquired position corresponding to a current position indicated by the position information currently acquired by the position information acquisition section, and the subject currently recognized by the object recognition section and to identify, when the subject and one attention object candidate included in the first attention object data coincide with each other, the subject coinciding with the attention object candidate as an attention object; and an attention object output section configured to output information for identifying, on an image, the attention object identified by the attention object identification section (119; 119A). an image input section configured to receive image data output from an imaging unit for imaging a subject, the image data including the subject; a position information acquisition section (113; 113A) configured to acquire position information indicating a position of the image processor; an object recognition section configured to recognize the subject in the image data input from the image input section; an attention object list management section (121; 121A) configured to manage, for each position previously acquired by the position information acquisition section (113; 113A) upon receiving image data, a first attention object list including first attention object data indicating one or more attention object candidates selected from among subjects recognized in the image data that is previously received at the corresponding previously acquired position; an attention object identification section (119; 119A) configured to perform comparison processing of comparing the first attention object data, including one or more attention object candidates and previously acquired position information indicating a previously acquired position corresponding to a current position indicated by the position information currently acquired by the position information acquisition section, and the subject currently recognized by the object recognition section and to identify, when the subject and one attention object candidate included in the first attention object data coincide with each other, the subject coinciding with the attention object candidate as an attention object; and an attention object output section configured to output information for identifying, on an image, the attention object identified by the attention object identification section (119; 119A).