1. An in-vivo examination system comprising: a body-insertable apparatus that moves in a subject; and an external device that acquires information about an inside of the subject from the body-insertable apparatus, the external device including a location acquiring unit that acquires a plurality of first locations of the body-insertable apparatus in the subject; a trajectory generating unit that generates a first movement trajectory of the body-insertable apparatus in the subject, based on the plurality of first locations, by connecting a plurality of sequential points; a trajectory storage unit that stores a second movement trajectory that is a standard movement trajectory that is obtained when the body-insertable apparatus moves in a standard subject, the second movement trajectory being generated by connecting a plurality of sequential points, the second movement trajectory being defined by a line formed by copying a lumen of a standard subject previously stored and connecting center points of the lumen; a scale adjusting unit that adjusts the first movement trajectory to the second movement trajectory by partially and/or entirely reducing or enlarging a scale of the first movement trajectory so that a current location on a movement trajectory being currently acquired in the first movement trajectory is acquired as a current location on the second movement trajectory; a trajectory image generating unit that generates an image of the second movement trajectory; an average color bar generating unit that acquires image data from the body-insertable apparatus, calculates an average color of the acquired image data in each set of the image data, generates a hue image that visually represents the hues of each set of image data in one color, based on the calculated average color, and generates an average color bar image by combining the generated hue images in chronological order; a display unit that displays a current location of the body-insertable apparatus acquired by the location acquiring unit, the current location being superimposed on an image of the second movement trajectory, and displays the image of the second movement trajectory together with the average color bar image; and a relevant information storage unit that stores relevant information associated with one or more second locations set on the second movement trajectory, wherein the relevant information contains average colors at the second locations with which the relevant information is associated, the calculated average color is compared with a value of an average color that stored as the relevant information in the relevant information storage unit, and a notification is made based on the comparison result.