Provided are an image diagnosis support device, method and program, and a heart simulation system, wherein it is possible to determine candidate positions at which to implant electrodes prior to performing CRT. The image diagnosis support device comprises: a shape information acquiring unit that acquires, from a three-dimensional image which includes a heart, shape information of at least one coronary vein, the information including the size of the diameter and the course of the coronary vein； a distal position acquiring unit that, on the basis of the shape information and information indicating the diameter size of an electrode lead wire on which a plurality of electrodes are arranged at set intervals, acquires the most distant position at which the electrode lead wire can be inserted； and a candidate position acquiring unit that, on the basis of position information indicating the distal position and the positions at which the plurality of electrodes are arranged, acquires at least one piece of information indicating candidate positions for the plurality of electrodes, which are candidates for positioning the plurality of electrodes inside the coronary vein.La présente invention concerne un dispositif support de diagnostic d'image, un procédé et un programme, et un système de simulation cardiaque, grâce auxquels il est possible de déterminer des positions candidates auxquelles implanter des électrodes avant d'effectuer la CRT. Le dispositif support de diagnostic d'image comprend : une unité d'acquisition d'informations de forme qui acquiert, à partir d'une image tridimensionnelle qui comprend un cœur, des informations de forme d'au moins une veine coronaire, les informations comprenant les dimensions de diamètre et de longueur de la veine coronaire ； une unité d'acquisition de position distale qui, sur la base des informations de forme et des informations indiquant la dimension de diamètre d'un fil conducteur d'électrode sur lequel une pluralité d'électrodes sont
