1. A video editing apparatus comprising: an input unit that inputs first video data and second video data in which the same subject is captured; a subject size detection unit that detects a representative size of the subject in both the first video data and the second video data as a subject size; a subject size change amount calculation unit that calculates a proportion of the subject size in the second video data to the subject size in the first video data as a subject size change amount; a playback speed correction amount setting unit that sets a correction amount for correcting a playback speed of the second video data in accordance with the subject size change amount by referring to a table; a playback speed correction unit that generates third video data by correcting the playback speed of the second video data in accordance with the correction amount set by the playback speed correction amount setting unit; and a video data concatenation unit that concatenates the first video data and the third video data so as to enable continuous playback of the first video data and the third video data, wherein a relationship between the subject size change amount and the correction amount for correcting the playback speed of the second video data is set in advance in the table such that the playback speed of one of the first video data and the second video data that has a larger subject size is slower than the playback speed of the other video data.