1. An information processing apparatus, comprising: a central processing unit (CPU) configured to: connect a plurality of partial images to obtain a combined image, wherein the plurality of partial images are obtained by imaging a region to be observed; generate connection information of the combined image, wherein the connection information includes: at least a plurality of connection portions of the plurality of partial images and connection reliability information of the plurality of connection portions, and information related to at least one of a presence of a foreign body or a position of the foreign body; change a display mode that corresponds to a connection portion of the plurality of connection portions, between two adjacent partial images of the plurality of partial images based on the connection reliability information corresponding to the connection portion; and supply the display mode, the connection information and the combined image to an image display apparatus that displays the combined image.